Hearts have re-signed Craig Gordon on a two-year contract.
The Scotland goalkeeper had announced his departure from Celtic on Sunday night after rejecting a new contract offer following six season at Parkhead.
The 37-year-old started his career at Tynecastle, winning the Scottish Cup and the Scottish Football Writers' player of the year award in 2006.
Gordon left for Sunderland in a £9million deal in August 2007 but will now be reunited with his former Hearts team-mate Robbie Neilson, who has also made a return to the club as manager.
In an Instagram post on Sunday night, Gordon thanked his Celtic colleagues, including goalkeeping coach Stevie Woods, after listing his honours at the club - six titles, five League Cups and three Scottish Cups.
He added: "The last six years have been the most successful period of my professional career, and I would like to thank everyone who has played their part in making this possible.
"The club, for initially taking a chance on someone who hadn't played in nearly three years. And to Woodsy for encouraging me to make the move in the first place, and for training me ridiculously hard ever since.
"I've had the pleasure of playing alongside some brilliant team-mates - who without, my time at the club would have been very different.
"The fans, for their support. Home, away... all over the world. Thank you. My family, who have been there through it all. The ups and downs, the miles, the sacrifices, the celebrations. I hope I've made them proud.
"At 37, and with a few years in me yet, I just want to play the game I love, and have played for 20+ professional seasons. Football can make for difficult decisions, but I'm looking forward to the next chapter and challenge. Thank you, again."
