Giallorossi director of sport Walter Sabatini announced they had agreed terms with both the player and his club.
"There is a Roma offer for Bojan, but we are still studying and evaluating it," spokesman Toni Freixa told the official Barca website.
"It's unlikely Roma can say talks are finished when they are still being considered.
"Clearly when there is an offer and the club consider it, that's because there is a chance the move could be completed."
It's believed to be a switch worth 10m, but with a clause so Barcelona can buy the striker back within a few years for 12m.
"We will not reveal the details of any negotiations, as we must safeguard the interests of Barcelona."