Tottenham attacker Heung-min Son admits he's been disappointed with his form this season.

There are excuses to be made if he wishes. A fractured cheekbone suffered in November meant he wasn't 100 per cent fit when he went to the World Cup. It has been a challenging season.

"I am not blaming that," he told the Daily Mail. "I am just really frustrated. If I wasn't then I would be crazy. I am really honest about this. I have a chance to help the team but can't seem to do it like last season.

"It is difficult. I am always watching my games back and trying to improve and see what I can do better.

"I have had some unbelievable previous years that I won't forget but sometimes bad times make you stronger and I am just trying to speak positively now.

"I know the fans want more from me. So do I. I agree with them 100 per cent when they criticise and I feel sorry to the team and the fans and the club. The expectation has been high because I have done well for so many years. I have to do that again."