Tsimikas has joined Liverpool for a fee reported at €13m by the British press and €16m by their Greek counterparts.
He will wear the number 21 shirt at Liverpool.
Welcome to Liverpool, Kostas Tsimikas! 🔴✍️
— Liverpool FC (Premier League Champions 🏆) (@LFC) August 10, 2020
The 24-year-old leaves Olympiacos after 86 appearances and will serve as a backup to Andy Robertson at Anfield.
Speaking to the official Liverpool site after signing his contract, Tsimikas expressed his happiness at joining the Premier League champions.
“I’m very happy, I’m very proud to be here. For me, [it’s] the biggest club in the world,” said Tsikimas. “It’s an honour to be here and I will give my best
“The league here, I like a lot. I watch it on the TV and it was always one dream I had from when I was a kid to come to play in this league and to come through.
“With a lot of work and focus on what I do and what the coach wants, and every day working hard in training, I can be on the highest level.
“[I want] to achieve [our] goals. To win the league again and also to win the Champions League.”