Georgios Giakoumakis and Filipe Jota arriving while Odsonne Edouard is set to finally check out in a deal worth more than £15m.
Hoops chiefs are finalising the £2.1m deal for Greek international Giakoumakis from Venlo while a season long loan move has been agreed for Benfica winger Jota.
Celts are also preparing for a hectic final few hours of the window as they look to bring in another centre back on loan, but Bournemouth are close to agreeing a fee for Ryan Christie.
Burnley are also interested but the playmaker is understood to be cool on the prospect of a move to Turf Moor. Additionally, hitman Edouard is expected to seal his Parkhead exit after Crystal Palace launched their late bid to land Frenchman.
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