Manchester United are keeping tabs on Ricky van Wolfswinkel's situation at Sporting Lisbon.

The former FC Utrecht striker's form at Sporting has attracted the attention Europe's biggest clubs, says Correio da Manha, including United, AS Roma and Inter Milan.

Van Wolfswinkel has scored four goals in five league games for Sporting and also twice in the Champions League.

The Dutchman was watched by Liverpool boss Kenny Dalglish last year, but now United scouts are tracking his exciting progress.

Van Wolfswinkel is tied to Sporting until 2016 and his deal carries a €22 million buyout clause.