Manchester United are preparing a 15 million pound bid for Bayern Munich full back Phillip Lahm, according to a report in the Sunday Mirror this morning.

Anthony Clavane writes: "Manchester United are set to launch a £15million bid for Bayern Munich star Philipp Lahm this January. Sir Alex Ferguson is concerned at his ageing Manchester United defence, with Gary Neville in the twilight of his career and doubts over Rio Ferdinand’s long-term future."

Clavane adds: "Rafael is seen as Neville’s successor, but Ferguson sees 26-year-old Lahm as a potential mentor to the young Brazilian. Lahm is seriously considering his Bayern future after he was fined for publicly questioning Louis van Gaal’s role as manager."

Lahm, who can play as both a right back of left back, is contracted to the Bavarian giants until the end of the 2011/2012 season. The German international (54 caps/2 goals) is recognised as one of the finest defenders in world football.

During the opening months of 2009/2010, Lahm has played 16 matches for Bayern, providing one assist and picking up one yellow card as the Bundesliga side have struggled both domestically and in the Champions League.