Celtic are negotiating with Manchester United over a loan deal for Scott McTominay.
The 22-year-old Scotland international midfielder is understood to be available on loan, having failed to feature regularly in the first team under Jose Mourinho or Ole Gunnar Solskjaer.
He has made only three starts in the Premier League this season and four substitute appearances, including the 1-0 win over Tottenham at Wembley on Sunday.
He has also made one start in the FA Cup against Reading.
Celtic boss Brendan Rodgers refused to be drawn on a deal to bring McTominay to Celtic Park.
"There's lots of speculation around players, so I wouldn't comment," said Rodgers on Thursday.
"He's a very good young player. When he broke into the team at Manchester United, I think he showed that. He's a fantastic talent, but there's nothing more to say."
Celtic have brought in three new signings so far this window - with two American players, Manny Perez and Andrew Gutman, also expected to join.
As a result, Sky Sports News understands, Celtic may be forced to offload players to finance any deal with United for McTominay.
Rodgers has revealed that some fringe players like 27-year-old midfielder Scott Allan, who was on loan to Hibernian last season, and 22-year-old attacker Lewis Morgan, who signed a four-and-a-half-year deal from St Mirren in January 2018, are likely to move out to get game time.
"There will be movement both ways towards the end of the window. We've got a big squad, and there will be players that go out to find game time," he added.
"Scott Allan has been unfortunate for his time here. He's a player that I've really liked.
"He is at the age now where he just wants to play football. There have been some inquiries about him. Same with Lewis and a number of other players.
"So I have spoken to them about game time and it is something that might happen over the next couple of weeks."