Matt Derbyshire has completed his move from Blackburn to Greek champions Olympiacos on a four-year deal.
The 23-year-old, who scored eight goals in 11 appearances in a loan spell which began in January, said: "I am very happy with this transfer. I wanted to stay at Olympiacos.
"I hope to improve myself and become much better next season. I want to score more goals with Olympiacos."