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.
Everton have announced they have reached a deal with FC Twente to sign Holland midfielder Leroy Fer.
The 23-year-old will now travel to Merseyside to discuss personal terms and undergo a medical.
Fer started his career at Feyenoord before moving to FC Twente in 2011, for whom he scored 10 goals in 29 appearances.
Fer has made two full appearances for Holland and is an international team-mate of Johnny Heitinga, who scored a late winner to sink Bolton in the FA Cup fourth round on Saturday.
After the game, Everton boss David Moyes bemoaned the lack of options in his squad but indicated he was hoping to bring in either a striker or midfielder before the end of the month.
Fer, nicknamed 'The Bouncer' due to his physical strength, hit the headlines last year when he spent £22,000 on a horse for his girlfriend, only to find she could not keep it as she lives in a block of flats.