Barcelona have made David Alaba their No. 1 target as they look for an upgrade for Jordi Alba.
Philipp Max and Junior Firpo have been considered as alternative targets.
Alaba, who has two seasons remaining on his deal with Bayern, offered himself to Barca through his agents several weeks back.
"The player is interested in coming," a source at Barcelona told ESPN FC. "It's a complicated operation, but not an impossible one."