It is speculated that Manchester United will not offer star striker Zlatan Ibrahimovic a new contract after the expiration of his current deal on 30 June.
The Swede agreed a one-year contract, with an option for second season, last summer.
But Zlatan suffered a knee ligament injury in April, which threatens the probabilty of an extension deal, which has yet to be triggered.
Former England defender John Terry will be among the high-profile free agents available this summer, following his exit from Chelsea, while Manchester City have already confirmed goalkeeper Willy Caballero, winger Jesus Navas and full-backs Gael Clichy and Bacary Sagna are to be released.
Midfielder Joey Barton is also looking for a new club after his release from Burnley, although he is serving an 18-month ban for betting offences.
Ibrahimovic made 46 appearances in all competitions this season, scoring 28 goals, and helped Jose Mourinho’s team lift the Community Shield, the League Cup and the Europa League trophy.