Marco Amelia has failed to rule out a return to Roma just days after Milan signed him outright from Genoa.
The Italian giants have decided to keep the goalkeeper after he initially joined the outfit last summer.
However, the 28-year-old, who will again probably be a reserve to Christian Abbiati next term, has opened the door for an immediate switch.
"I am now totally a Rossoneri player, but I would sacrifice the Champions League for the Europa League if the call that I am waiting for arrives," he told Radio Erre2.
"Everyone knows that I am a Roma supporter and I would go to that club on foot if necessary.
"Even the Milan directors are aware of this. Let's wait and see who the new Roma boss is and then who knows…"
The 2006 World Cup winner started his career in the Giallorossi youth sector, but he never made a Serie A appearance for the club.
He left Roma in 2001 to join Livorno and has since also played for Lecce, Parma, Palermo and Genoa.