Aston Villa winger Aleksandar Tonev has joined Serie A newcomers Frosinone on a permanent deal.
The 25-year-old Bulgarian moved to Villa Park from Lech Poznan in 2013.
Tonev, who spent part of last season on loan at Celtic, made a total of 20 appearances for the Villans.
Tonev played 13 times for Celtic during the 2014-15 campaign.