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Odsonne Edouard has completed his £14m move to Crystal Palace, signing a four-year deal with the Premier League side.
It comes as Celtic announced the signing of Greece striker Girogos Giakoumakis, and a loan deal for Benfica winger Jota.
Edouard netted 88 goals in 179 appearances for Celtic after joining from Paris St-Germain in 2017.
"Scoring goals in the Premier League may be the biggest challenge in my career," Edouard said.
"But I'm confident in myself and my team-mates to be successful."
The Frenchman formalised a move to Glasgow after an initial loan spell for a club record fee in excess of £8m in 2018, and won three Scottish Premiership titles and four domestic cups with Celtic.
New signing Giakoumakis, who has signed a five-year deal, finished as top scorer in the Dutch Eredivisie last season with 26 goals for VVV Venlo.
The Greece international says he is looking to emulate his compatriot Georgios Samaras, who had a successful spell in Glasgow.
"I've watched a lot of Georgios' games and we worked together in Greece, he's now the president of OFI Crete, where I played for two years," he said.
"We've known each other for a while and we keep in touch, I've learned lots from him and that's made me even more excited to come and play here."
Celtic have an option to buy Portuguese youth international Jota at the conclusion of his loan spell next summer.
Meanwhile, Ryan Christie has departed for Championship side Bournemouth as striker Leigh Griffiths also left on loan for Dundee.
The summer transfer window closes at 23:00 BST on Tuesday in England and an hour later in Scotland.
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