He said: "I didn't see what happened but we hope it's nothing too serious as he's been fabulous over the last eight or nine games.
"It could be ligament damage but we will know more in a day or two."
Sports writer Alistair Mason asks whether the Champions League is losing its lustre.
Harry Kane has shot to prominence after breaking through into Spurs' first-team this season.
Chelsea's Eden Hazard has been been nominated for the April PFA Fans' Player of the Month Award.