Tottenham manager Mauricio Pochettino says Dele Alli's hamstring injury has come at the "worst moment".
Alli has been ruled out until early March after sustaining the problem in Sunday's 2-1 win over Fulham, the third time he has suffered a hamstring injury this season.
The 22-year-old joins Harry Kane in the treatment room and the influential pair are going to miss a crucial part of Spurs' campaign, starting with the League Cup semi-final second leg with Chelsea tonight.
They are also set to miss the FA Cup fourth-round tie at Crystal Palace, the Champions League last-16 first leg against Borussia Dortmund, the League Cup final if they beat Chelsea and a host of important Premier League games, potentially including the north London derby.
Pochettino said: "Now we need to be positive like with Harry Kane. Of course, we are going to miss him for a long period. It's one of the worst moments because we have ahead very busy fixtures."