Paul Pogba and Antonio Rudiger aren't the only high-profile Premier League stars flirting with the exit door at the moment.Almost every single team in the league has at least one important player on the verge of leaving for free in the summer, and they've got their work cut out to agree deals with them before it's too late.From January 1, these players are able to sign a pre-contract agreement with overseas sides, and for many English clubs, the next few weeks represents the last chance they have to tie their players down or recoup a transfer fee.With clubs and agents preparing to do battle, here are nine Premier League stars whose contracts expire at the end of the season.The Manchester United midfielder has been linked with a move away.
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