Manchester United striker target Robert Lewandowski says he knew he wouldn't leave Borussia Dortmund in January, but the Poland international admits he is unsure over where his long-term future lies as he continues to be linked to move to Old Trafford.

Juventus and Bayern Munich have also been connected with the star, who scored 17 goals in 26 appearances for his side, but a deal never materialised in the winter window.

United were believed to be considering Lewandowski while Wayne Rooney suffered from a goal drought, with Sir Alex Ferguson looking to increase his side's goal difference so they couldn't get caught out by Manchester City on that front again.

But the 24-year-old says he never wanted to leave Dortmund mid-season, though the future could tell a different story.

"I knew I wouldn't leave Borussia this winter, that is why I kept my distance from most of the news," he told Przeglad Sportowy.

"I might have been nervous if that was my only source of information."

On his long-term future, Lewandowski explained: "I can't answer that question. Everything is possible. I'm not ruling out any possibility right now."

While Rooney has found his form again for United, with 10 goals in his last 10 games for the club, Ferguson has made clear his intentions to have multiple options up front.

And should Rooney move into more of a midfield role as the likes of Ryan Giggs and Paul Scholes retire, as some have suggested, Lewandowski could be a long-term target for the Scot.