Harry Kane has suffered a tear in his left hamstring, but Tottenham have given no indication how long the striker will be out for.

The England captain will definitely miss Sunday’s FA Cup trip to Middlesbrough while the club’s medical staff “continue to review the injury with treatment ongoing”.

Kane, who limped out of Spurs’ defeat at Southampton on New Year’s Day, tweeted on Friday afternoon: “Head up. Tough times don’t last, tough people do.”

Tottenham head coach Jose Mourinho was fearing the worst over Kane’s condition in a press conference earlier in the day.

The Portuguese said: “If you ask me just my feeling – good news or bad news – I am more on bad news than good news, that’s my feeling.

“What the player felt, Harry Kane leaving a match, the way he did it, he didn’t think twice, it didn’t take him two seconds to realise the severity of the situation.

“Some opinions from the medical department before the test results. I don’t think we’re going to have good news.

Another player who will be at The Riverside Stadium is Christian Eriksen, even though his future is unclear.

Eriksen is now free to discuss a move with European clubs while he might also be sold, after telling Spurs he will not be signing a new contract.

The only thing that Mourinho can guarantee is that Eriksen will be involved at Boro.

“I don’t know and I am being honest,” he said when asked about his future. “You know the situation, in this moment he can agree with any club for the end of the season. That is one option.

“Another option is a club and himself want to do a deal in January, but in that situation our club is in control.

“We have the control of the situation. Another possibility is he stays. In this moment he is here, he is our player.

“I can say Harry Kane and (Tanguy) Ndombele will not be at Middlesbrough, I can say Christian Eriksen will be at Middlesbrough.”