Everton's Ross Barkley did not make it on to the field for England at Euro 2016.
The Newcastle United man's agent is speaking with "many clubs".
The defender was released by Leeds United earlier this month.
The Tottenham Hotspur defender saw England crash out of the tournament this week.
The two 19-year-olds played together at Fulham and will now be turning out for Brendan Rodgers' Celtic next season.
Lewis Cook trained with Leeds United's first team yesterday.
Kyle Lafferty left Ibrox side Glasgow Rangers back in 2012, but his career has failed to take off since then.
The 24-year-old joined Liverpool for £30 million today.
The Argentine international spent last season out on loan at Getafe.
The American goalkeeper left Everton for a return to MLS this summer.