Keeper Vasilis Barkas has joined Celtic from AEK Athens on a four-year contract.

The 26-year-old has featured 10 times for Greece.

"I'm very happy to be here, it's a dream to come to one of the biggest teams in Europe, and I can't wait to play for Celtic," said Barkas.

"Winning medals and trophies is why I came here. I want to win 10-in-a-row, and I want to help us get into the Champions League."