Jose Mourinho is trying to be "optimistic" about the injury Harry Kane suffered towards the end of Tottenham's 2-2 draw with Everton on Friday but accepts it is too early to know its severity.
Kane was in lethal form for Spurs at Goodison Park, as he has been for much of the season, as he scored both goals for Mourinho's side.
The England captain's first effort saw him reach 20 Premier League goals in a season for the fifth time, a record bettered by only Alan Shearer (seven) and Sergio Aguero (six).
His second – the goal that secured Spurs a point – was his 12th in as many games against Everton in all competitions and it moved him above Robbie Fowler into seventh in the Premier League's all-time top scorers' list with 164.
But he was unable to finish the match, as Richarlison fell on Kane's ankle in second-half stoppage time and the collision forced him off.
With just nine days to go until Spurs are in EFL Cup final action against Manchester City, it is a nightmare scenario for Tottenham and Mourinho.
After the match, Mourinho tried to put on a brave face but could not offer much certainty.
When it was put to him by Sky Sports that Spurs fans would be anxious, Mourinho said: "Me too but I think it's too early to say something.
"For him to leave the pitch at 2-2 with only a few minutes to go, it's obviously because he felt something, but let me be optimistic and believe that he has time to recover.
"Let me be optimistic and believe it's nothing serious. It's obvious he's a very important player for us, but I cannot say much or speculate."
England manager Gareth Southgate was also in attendance and will surely monitor Kane's situation closely with the delayed Euro 2020 less than two months away.
The draw on Merseyside leaves Spurs five points adrift of fourth-placed West Ham, who play their game in hand against struggling Newcastle United on Saturday.