Manchester United defender Chris Smalling spurred to new heights by threat of January exit

Chris Smalling says the prospect of a big-money signing taking his place is in Louis van Gaal's side is one reason behind his excellent form this season as he seeks to stay injury-free during 2016

Manchester United defender Chris Smalling

The threat of being replaced during the transfer window helps keep players on their toes and has spurred Manchester United defender Chris Smalling to new heights.

Smalling has enjoyed an excellent campaign at Old Trafford after the club was linked with a big-money move for a defender in the close season.

"It does spur you on. When you come to Manchester United, in every transfer window - whether the team is doing well or badly - there are always players linked with the club because this club is always linked with the best players," Smalling told United's official website.

"It keeps you on your toes and spurs you on. You can't rest on six months of good performances because as soon as you have a blip, there is always another player to take your place."

United host third tier Sheffield United in the FA Cup third round on Saturday, followed by league trips to Newcastle United and Liverpool.

Smalling, 26, is hoping to continue his development in 2016.

"I have stayed relatively injury-free and have been able to play games, build up and keep learning. I take a lot of positives from that," Smalling said.

"We have had a lot of injuries in the centre-back positions, so in these last 12 months I have been happy and injury-free with the manager's faith.

"I don't make too many resolutions but if I can stay injury-free again then I would wish for that."

United host third tier Sheffield United in the FA Cup third round on Saturday, followed by league trips to Newcastle United and Liverpool.