The Brazilian keeper, who refused to sign a new deal at Ashton Gate in the summer and has been dropped from the first team, may be allowed to leave City during Jaunuary if it suited the club, according to his agent John Halliwell.
"Bristol City have informed us they could be willing to let Adriano leave on a free transfer in this transfer window under the right circumstances," Halliwell told Sky Sports.
"As his contract is up at the end of the season they could consider letting him go this month."