• Spurs striker injures ankle in clash with Fabian Delph • ‘We hope he can recover but it doesn’t look good’

Son’s solo effort secures win for Spurs after Lloris saves Man City penalty Read more

Mauricio Pochettino’s happiness at overseeing a 1-0 Champions League victory over Manchester City was tempered by the loss of Harry Kane to yet another ankle ligament injury – the Tottenham manager fears it will rule him out for the remainder of the season.

Son Heung-min scored the goal on 78 minutes that has given Spurs the advantage at the midway point of the quarter-final, but Kane’s injury cast a shadow. The striker, who came in for some rough treatment from various City players, went into a strong challenge on Fabian Delph in the 55th minute and he came off worse. Delph turned on Kane straight away as he felt that the tackle was late and excessive.

Pochettino had a verbal exchange with Delph and it was immediately apparent that Kane had a serious problem. He was helped down the tunnel towards the dressing room and departed the ground on crutches.

Harry Kane (@HKane) Gutted to go off injured but every setback is a chance to come back stronger than ever. Big finish from the boys to go on and win! #COYS #UCL pic.twitter.com/vWR79WlMT6

It is the fifth time that Kane has suffered ankle ligament damage, with his most recent problem coming against Manchester United in January and leading to a six-week lay-off. He hurt the left foot on that occasion and it was the same one here. Previously, the damage was always to the right foot.

Kane will undergo scans once the swelling has subsided but Pochettino made it plain that he expects the worst. It could also represent bad news for England, who will contest the Nations League finals in early June.

Pochettino said: “I am worried he will miss the rest of the season. We hope it’s not a big issue and he can recover as soon as possible but it doesn’t look good. If you see the action, it shows he twisted his ankle and maybe damaged the ligaments again. We will check in the next few days. It is so painful but what can we do?”

Pochettino was asked about his conversation with Delph. “I said to him he was lucky because the referee was checking and maybe the way the action was, it could have been a red card,” he said. “But I think both were fighting for the ball and had no intention to hurt each other. The conversation was very friendly.”

The Fiver: sign up and get our daily football email.

It was an evening when controversy flared. The stewards had to remove a pitch invader in the second half, with Pochettino also running on from his technical area to supervise the situation. The Argentinian walked back shaking his head. Uefa is sure to investigate the incident and it is likely that Spurs will be punished.

Supercharged Son jolts City to show Spurs can prosper without Kane Read more

Then there was City’s early penalty, taken by Sergio Agüero and saved by Hugo Lloris. It was awarded by VAR after what, in real time, had seemed like an innocuous incident. The replays showed that Raheem Sterling’s shot had caught Danny Rose’s arm. “Tonight showed that there is still a lot of work to do with the system,” Pochettino said. “Technically it was a penalty because it was handball but I don’t think there was any intention.

“Yet I know next season every time the ball hits a hand or arm in the penalty box, the VAR is going to give a penalty. It’s going to be a big problem and change the spirit of the game. The protocol needs to be clear. If not, there is going to be a big problem.”

City lost Bernardo Silva to a muscular injury during training on Monday and Pep Guardiola had to defend his decision to start with Riyad Mahrez, together with Ilkay Gündogan, who he preferred to Kevin De Bruyne.

Quick guide Follow Guardian sport on social media Show Hide Twitter: follow us at @guardian_sport Facebook: like our football and sport pages Instagram: our favourite photos, films and stories YouTube: subscribe to our football and sport channels Photograph: Chesnot/Getty Images Europe

He said: “We played an incredible game and we controlled it. The result is not the best one but it is just one and in the Champions League, you have to make comebacks to go through. I don’t have the feeling we played bad, although the result wasn’t good.

“But last season [against Liverpool in the quarter-final first leg], it was much, much worse. Sometimes 1-0 is better than 0-0 because it’s clear what we have to do. We know we have to score goals.”