Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
Chelsea striker Fernando Torres is understood to be set for a return to Atletico Madrid, according to Sky sources.
West Brom have broken their transfer record with the signing of forward Stephane Sessegnon from Sunderland.
Announcing the news late on transfer deadline day - in the final hour before the summer window closed at 11pm - Albion confirmed that 29-year-old Benin international Sessegnon had joined them on a three-year-contract.
The club said the fee was a record one which surpassed what they agreed with Reading for Shane Long in August 2011, but that it was undisclosed.
The Baggies had earlier confirmed two other signings in Marseille midfielder Morgan Amalfitano, recruited on loan until the end of the season, and Northern Ireland international goalkeeper Lee Camp, previously free agent, on a rolling contract until January.
Sessegnon arrived in English football in January 2011 when Sunderland signed him from Paris St Germain.
He went on to make 97 appearances for the Black Cats, scoring 18 goals.
Amalfitano, 28, has been with Marseille since the summer of 2011.
He has one international cap for France and has also played for Lorient and Sedan.
Camp has been signed as cover for Albion's injured England stopper Ben Foster.
The 29-year-old has spent time at Derby, Burton, QPR, Norwich and Nottingham Forest.