Dimitar Berbatov won't return to Bayer Leverkusen unless Manchester United release him on a free transfer Paris St Germain, backed by the Qatari royal family, failed to follow up an interest in Berbatov in January, but the forward's representative has admitted that the player would be open to a move to the Champions League qualifiers. Meanwhile, United youngster Will Keane has undergone a scan on a knee injury sustained while playing for England U-19s against Switzerland at Preston on Wednesday. The 19-year-old, who made his Premier League debut for United against Blackburn last December, left Deepdale on crutches, but despite initial fears that he may have suffered ligament damage, Football Association medical staff believe that Keane's injury is not likely to lead to a lengthy lay-off. With Berbatov expected to follow Michael Owen through the exit door at United this summer, however, Keane is expected to be drafted into Ferguson's senior squad next season. United will play Shanghai Shenhua -- managed by Nicolas Anelka -- in the Chevrolet China Cup in Shanghai on July 25. The fixture was announced alongside details of a five-year partnership deal between United and Chevrolet.