The 32-year-old midfielder also agreed an option in the club's favour to extend the deal for another season after that and will wear the number 21 jersey.

Diop, who leaves behind relegated Portsmouth, will now link up with his team-mates on a training tour of Australia.

In an interview on aek.gr he said: "I wanted to leave Portsmouth. I had already spent six years in England and wanted to try a new perspective. I talked to the president, who called me and told me how much he wanted me to move to AEK.

"At that time I had gone on vacation but when I returned to England, I pushed for a move from my side of things."

AEK finished fourth in the Greek top flight last season, and when asked about his initial impressions, he added: "The truth is that I'm impressed. I was not expecting it. I've played in other countries, England, France, Switzerland and I have not come across as warm an attitude anywhere else in the world.

"This reception I got is an incentive to fight with all my strength for this group."