Heung-Min Son says he's open to extending his contract with Hamburg.

The South Korea striker was asked about the interest of Manchester United, Chelsea and Tottenham on national German television on the weekend.

"Why not extend my contract? It's an opportunity. I feel very comfortable with life in Hamburg," he told ZDF.

"I still have a contract until 2014, we will talk about it when the time comes. We should not worry about it now."