Chelsea have completed the signing of Mohamed Salah from Basel.
The Blues announced on Thursday night the signing of the 21-year-old Egyptian winger, subject to the agreement of personal terms and the signing of a medical.
And, before Sunday's FA Cup fourth-round tie with Stoke, the club confirmed the deal has been concluded.
The deal is for a reported fee of £11million as Chelsea signed the forward ahead of Liverpool.
Once it was clear Juan Mata was to join Manchester United, Chelsea boss Jose Mourinho began looking for a replacement and Salah immediately came to mind.
Salah has played against Chelsea four times in the last 12 months, scoring three times, including in Basle's two Champions League Group E victories over Mourinho's men earlier this season.
Speaking on Friday, Mourinho spoke of his admiration for Salah, the potential of the player and said the Blues made their move quickly.
"I like the fact that he can play the same way our attacking players do, which is players with adaptability, to play right, left, or behind the striker," Mourinho said.
"He's young, he's fast, he's creative, he's enthusiastic. When we analysed him he looks the kind of humble personality on the pitch, ready to work for the team and to work and to adapt himself to a new life.
"We believe if he comes that he will have a similar process to the Willian one. Willian needed two or three months to grow up and to feel comfortable playing for us [following his August signing from Russian club Anzhi Makhachkala].
"We think with him and [Andre] Schurrle, [Eden] Hazard, Oscar and Willian we will be fine.
"We lose an experienced top player like Juan, but we bring in a young player with great potential.
"Willian did that transition from his previous world to the top world of football. Hopefully, if Salah comes, he can do the same.
"We are ready to help, we are ready to support.
"He has some experience in Europe, the Europa League, Champions League, so he's not a naive boy arriving in the jungle.
"Hopefully he comes and hopefully with the talented players we have around in the same positions we all can develop together."
Mourinho believes Salah is joining the right club to grow as a person and as a player after he was caught up in controversy during his time at Basel.
Chelsea - January transfer targets
Chelsea - January transfer targets
1/18 Luke Shaw - Another potential long term successor to Ashley Cole, the Southampton youngster has impressed everyone and would surely command a fairly hefty fee given his side's recent success.
2/18 Sami Khedira - Currently out with a long term injury so a January signing looks unlikely but Jose Mourinho is said to be keen to link up with his former charge and the German is just the sort of player Chelsea need in midfield.
3/18 Fredy Guarin - At one point very close to signing with the club, the £15m Colombian, cooled for a while. However, with the move to Juventus, stalling - Chelsea may with the use the funds from Mata's transfer to Man Utd and make another bid.
4/18 Andrea Ranocchia - Chelsea are one of a few Premier League clubs chasing the Inter defender and you can see why, the tall centre-back is a handy player.
5/18 Claudio Marchisio - Juventus' early Champions League exit may leave them a little strapped for cash with Marchisio being mooted as a player to be sold in order to cover the shortfall. Chelsea would no doubt be interested in his midfield class should he become available.
6/18 Eliaquim Mangala - Another defender Mourinho is reportedly very keen on, the Porto centre-back would not come cheap although his club have admitted they would be willing to sell him for the right price. Manchester City have since shown an interest however.
7/18 Luis Suarez - Chelsea need a goal-scoring striker, so who better than the league's top scorer? A very unlikely move for a lot of obvious reasons.
8/18 Diego Costa - The Atletico Madrid man is another striker in red hot form and consequently he has attracted the attention of several Premier League clubs. Mourinho would no doubt enjoy swiping him from under Arsene Wenger's nose.
9/18 Xabi Alonso - Another of Mourinho's former players who would add experience and quality to Chelsea's midfield. Given his age shouldn't prove too expensive.
10/18 Radamel Falcao - Linked with Chelsea for some time, the free-scoring Colombian would cost a fortune to prize away from mega-wealthy Monaco, but the promise of Champions League football would surely be enticing.
11/18 Edinson Cavani - Another big name striker who would cost a lot to sign, this time from PSG, Cavani has again consistently been linked with a move to Stamford Bridge.
12/18 Hulk - Apparently fairly disenchanted at Zenit and another long time Chelsea target, nevertheless would seem an odd purchase given his usual berth is out wide - a position Chelsea have a ludicrous amount of depth in.
13/18 Jackson Martinez - Another Colombian reportedly on Chelsea's radar, the Porto forward has an excellent recent goal record but might represent more of a risk given he would still command a large transfer fee. With Juan Mata now in Chelsea's past, a new midfielder is needed.
14/18 Gonzalo Higuain - Seems unlikely given he only moved to Napoli in the summer, but Italian media are reporting that Chelsea are interested in the Argentine forward. Another of Mourinho's former men.
15/18 Wayne Rooney - Chelsea's main target over the summer and despite apparently being happier at Old Trafford has yet to sign a new contract. Failure to qualify for the Champions League would surely see Rooney depart. Will selling Mata to the champions make them loosen their tough stance on the England man?
16/18 Fabio Coentrao - With questions over Ashley Cole's place in the side, Chelsea are reportedly having a look at another Mourinho old boy, Real Madrid's Coentrao.
17/18 Mario Balotelli - Is a Premier League reunion with Super Mario back on the cards? That's what sections of the Italian press think. It seems unlikely given his previously very poor working relationship with Mourinho but you just never know.
18/18 Alberto Moreno - The young left back is another being touted as Ashley Cole's successor - with a buy out clause of £25m he wouldn't be cheap but then aged 21 he has a long future ahead of him.
During a two-legged Champions League qualifier between the Swiss side and Maccabi Tel Aviv last August, Salah refused to shake hands - instead changing his boots in one instance and bumping fists with his opponents in the other - while there were also comments attributed to him expressing an anti-Israeli sentiment.
Salah insisted the comments were fictitious and his actions were a result of external pressures.
Yet Mourinho has promised to nurture the 21-year-old at Chelsea, who are owned by Russian billionaire Roman Abramovich, who is Jewish.
"It's not a concern, because we know the club Chelsea is, I know the manager I am," Mourinho said.
"I know that Chelsea's capable of helping people and making people feel the way we think people should feel, which is in football and in life be open and respectful to every ethnicity, to every religion.
"People has the right to be what they are. Chelsea as a club, and me as a manager, we will be more than ready to help him."
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