Viljami Sinisalo has become Celtic's first summer signing after the goalkeeper joined for an undisclosed fee from Aston Villa.
The 22-year-old Finland international, who has signed a five-year contract, played 50 games on loan to Exeter City last season and previously spent time in Scotland at Ayr United.
He told the Celtic website "it feels amazing" as he joined the squad for their pre-season tour to the United States.
"I know Celtic is a huge football club and it’s really exciting to be part of something so big," he said.