The Greece international moves to the Cherries on-loan to the end of the season.
Bournemouth’s Head of Football Operations, Tiago Pinto, said: “Christos is a goalkeeper who will add real strength and quality to our squad, and we’re delighted to welcome him on board.
“Having competed in Italy, he has already demonstrated his ability at the highest level with both Lazio and the Greek national team. We’re excited about the impact he can make as he brings a sense of maturity and composure, while also continuing his development as a player.”
Mandas also said: “It’s an amazing feeling to be a part of this club. I feel so proud, it’s a dream for me to come here and I’m really, really happy.
“From the start, when I knew Bournemouth were interested, I knew that I wanted to come here. It feels like a magical atmosphere between the players and the fans, and I like the way the team plays, so it is the right move for me to come here.”