Toby Alderweireld says his performances prove he is happy at Tottenham and 100 per cent committed to the club, despite the ongoing uncertainty over his future.

Alderweireld was at the heart of a dogged rearguard display on Tuesday as Spurs beat Chelsea 1-0 in the League Cup semi-final first leg.

Spurs last week triggered a one-year extension in the defender’s contract to tie him down until summer 2020, but it activated a clause allowing him to leave for £25million at the end of the season.

Alderweireld’s team-mate Mousa Dembele is on the verge of a move to China after running down his contract, but the centre-half has been reintegrated into Mauricio Pochettino’s team despite refusing a new long-term deal last season.

“I’m very happy to stay another year,” said Alderweireld. “It was [a one-year extension] in my contract and I’m happy Spurs gave me the confidence to stay another year.”

Asked about the release clause, the Belgium defender said: “People can see that every time I play that I give 100 per cent for this club — this is what I keep doing every time I play.

“I’m only focused on things on the pitch. This is my fourth season and I’m very happy. I’m doing everything to help the team.”

Harry Kane’s penalty, his 20th goal of the season, was the difference between the London rivals, with referee Michael Oliver pointing to the spot after consulting the VAR.

Replays showed Kane was fractionally onside and clearly caught by Kepa Arrizabalaga after beating the goalkeeper to Alderweireld’s long pass.

Although it appeared to be a textbook use of VAR, Spurs manager Mauricio Pochettino — an entrenched critic of the technology — reiterated his belief that the system “kills the emotion” of football and said he did not celebrate Kane’s winner because he had been waiting “five minutes” for the decision.

Kieran Trippier, another impressive performer in Spurs’s defence last night, hopes VAR decisions will be be quicker in future, but could find no other fault with the system.

“It’s important — if VAR wasn’t there tonight, Harry would have been given offside,” Trippier said.

“But if you look at the Rochdale game [in the FA Cup last season], it took five minutes per decision.

“It’s a work in progress and hopefully it will speed up.

“We had the momentum in the game and it took, maybe, a minute and a half [for the decision].

“Sometimes it can take the momentum out of the game. That’s the only criticism I have.”

He added: “It was a good performance defensively. We all stood together. We had to dig deep and I thought we did that well. We’re in a good position.

“We know how tough it’ll be to go to Stamford Bridge [for the second leg] and get a result.

“It’s a great opportunity to get to a final.”