Cameroon and Manchester United goalkeeper is reportedly on his way out of the club, who have agreed a deal with another European team.
The Premier League transfer window closed last week, but Saudi Arabia and Turkey remain open for the next couple weeks.
Read: 10 Most Expensive EPL Transfers After Deadline Day
According to Fabrizio Romano, Turkish top-flight side Trabzonspor have reached an agreement with the Red Devils over a deal for the Cameroon international.
"Trabzonspor reach verbal agreement with Manchester United to sign André Onana on loan," Romano tweeted.
"Club to club verbal agreement in place and final decision now up to Onana.
"It’s only up to the goalkeeper."
Onana has only made one start in the League Cup and has not featured in the Premier League at all this campaign.
The Red Devils also signed Belgian goalkeeper Senne Lammens on deadline day and he is expected to fight for the number one jersey.
