Rumour Mill: Bayern Munich are "talking tough" with Manchester United over Owen Hargreaves

Bayern Munich have warned Manchester United they will not be bullied into selling Owen Hargreaves this summer. The England midfielder has been at the centre of a £20million tug-of-war between the two clubs since his performances at the World Cup last summer. So far the German champions have managed to resist United's advances despite repeated pleas from the 26-year-old to be allowed a move to the Premiership. Sir Alex Ferguson offered £20million for Hargreaves in the January transfer window but now Bayern chairman Karl-Heinz Rummenigge has claimed his club have no need to sell. "We have had a large offer for Hargreaves from United and it remains valid until this summer," he said. "But he has a contract until 2010 and we are in the fortunate position that our finances are in top-class shape. "We'll be presenting another first-class balance sheet this year, so we can still say 'no' if a club like United come in with a large offer for one of our players. "There aren't many players of Owen Hargreaves' quality in the holding midfielder position and our aim is to build a team capable of great things." Nani gloat from Sporting Lisbon Meanwhile, Sporting Lisbon have warned Premiership clubs that it will cost £13.5million to sign winger Nani. The 20-year-old has been attracting interest this season following his displays in the Champions League, with Tottenham the latest club linked with a move for the Portugal international. The youngster is believed to have a clause which would see him leave for £13.5million, with his club appearing reluctant to let him go for less. A Sporting spokesman told Skysports: "The club that wants the kid have a price. Only by this money would we be disposed to let Nani leave. "We know of the interest of several English clubs for Nani, and that is normal because of his quality - but until this moment we have received no offer in writing." Nani has been compared with Manchester United winger Cristiano Ronaldo, who was signed from Sporting in 2003. United have been linked with a move for the Portuguese prospect following their previous business with the club. French side Lyon have also been suggested as a possible destination. Nani is represented by Jorge Mendes, who is also the agent of Chelsea boss Jose Mourinho. "The decision depends on Sporting because the player has a deal," said Mendes. "But Nani is a player of enormous potential and other big clubs have asked about his situation." Highlights From 3 Previous Matches 50th anniversary of the Treaty of Rome and half a century of United's participation in Europe: Manchester United (plus Andy Cole) 4 - 3 European All-Star XI EPL 2006 - 2007: Manchester United 4 - 1 Bolton Wanderers FA Cup 2006 - 2007: Manchester United 1 - 0 Middlesbrough Reference: teamtalk.com, youtube.com