Ben Davies will miss the rest of Tottenham's season and Ryan Mason says it is too early to say if he will be ruled out of the Euros too.
Welsh left-back Davies has not played since Spurs's 2-0 win at Aston Villa in March, which he got through despite playing with the problem during that game.
Wales' manager Robert Page described the injury as 'significant' at the time.
And Davies has yet to make a full recovery despite initial estimates that he would sidelined for around three weeks.