The Brazilian ace looks set to leave the Bundesliga side in January, and has been linked with a host of clubs across Europe.
La Liga high-flyers Atletico Madrid – for whom the impish attacker has played before – were thought to be one of the leading suitors for his signature, but reports suggest that Diego himself is not keen to return to the Spanish capital.
That leaves Southampton as one of the front-runners, with Mauricio Pochettino open to the idea of signing the samba ace.
It is thought that the Argentine is looking to add some more creativity to his side over the coming windows, and sees the former Juventus star as an ideal solution.
Diego may be willing to move to England, with the opportunity to play in the Premier League potentially a tempting one for the 28-year-old.
The creative has represented his nation on 33 occasions; but is unlikely to be a part of their World Cup squad next summer after falling off of the radar for the Seleção.
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