Bayern Munich have stepped up their pursuit of Manchester United striker Dimitar Berbatov.
Bayern intermediaries have been in touch with both United and Berbatov's camp to register their interest ahead of the summer market.
Berbatov is now in the final 18 months of his current deal and frustrated by the lack of progress from United over opening talks about a new contract.
Bayern had scouts at Old Trafford on Saturday to check on Berbatov, who came off the bench to net a late winner against Bolton Wanderers.
