New signings will be ineligible to play for their new clubs once this season’s Champions League resumes.
Uefa have confirmed guidelines about revised squads after coronavirus forced the competition to be suspended before the last 16 ties had been concluded.
The news means Chelsea will be unable to call upon Hakim Ziyech or Timo Werner, should they complete a move for the RB Leipzig forward as expected, in the second leg of their last 16 tie against Bayern Munich, which they trail 3-0.
A Uefa statement read: “Teams will be allowed to register three new players on their List A for the remainder of the 2019/20 season, provided such players were already registered and eligible for the club since the last registration deadline [3 February 2020 for UEFA Champions League and UEFA Europa League; 18 March 2020 for the UEFA Women’s Champions League].
“List A will still only be able to contain a maximum of 25 players. It will not be possible for clubs to register newly-transferred players.”
Bayern Munich have won the race to sign Paris Saint-Germain’s Tanguy Louassi, but the French centre-back will be unable to play for his new team should they advance to the quarter-finals of the competition.
The competition will resume in August with Uefa confirming a ‘final eight’ mini tournament in Lisbon.
The remaining last 16 ties, including Bayern vs Chelsea and Man City vs Real Madrid could take place in the Portuguese city on 7/8 August if they are unable to go ahead as initially scheduled.
While the mini tournament, with ties reduced to one leg, will commence on 12 August followed by the final on 23 August.
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