Celtic have signed goalkeeper Craig Gordon until the summer of 2016, with the Parkhead club having the option of a third season.
The 31-year-old, capped 40 times for Scotland, began his career at Hearts before moving to Sunderland in 2007.
Injury has kept him out of football for the past couple of years but he is now fit to return and will link up with Ronny Deila's squad at their pre-season training camp in Austria.