Borrello, 22, is currently undergoing rehabilitation for a cruciate ligament tear.

"We had already made a verbal agreement with the player before his injury so it was self-evident for us we would stand by our word," Freiburg sport director Klemens Hartenbach said on Monday.

Borrello scored three goals in 20 games last season as Kaiserslautern were relegated to the German third division.

Freiburg, as per their policy, did not reveal the length of Borrello's contract with the club.