German source Bild claim that they have the inside scoop to the news and believe that the German side are targeting Immobile and Kagawa while Firmino is a target also but less likely.
They also manage to come up with estimations regarding the arrival of the players with a 25% chance that Kagawa will re-join the club while Immobile is a much 70% to join the club.
Kagawa has seen little playing time this season and since United are in the process of changing managers, he would most likely see where he fits into the plans of the next coach before making a decision on his future.
Meanwhile, Italian international Immobile is currently co-owned between both Torino and Juventus and a 25 million euro bid would be enough to tempt the two sides into parting with their respective player who leads Serie A's scoring charts with 21 goals.
And Brazilian Roberto Firmino has set the Bundesliga alight this season with his 14 goals and 12 assists in 31 appearances.