Celtic and Rangers are both busy as Ronny Deila and Mark Warburton look to increase their options to aid their respective title challenges.

The Premiership champions are running the rule over another Croatian player with midfielder Ljuban Crepulja a possible target for the January window. Deila is also said to be hoping he can tie down midfielder Tom Rogic on a longer contract after the Australian made his mark on the first team this season.

Rangers have already snapped up two players to join their squad in the summer but Warburton is reported to be returning with a further bid for Brentford's Toumani Diagouraga.

Scotland international David Marshall has emerged as a signing target for Everton but Roberto Martinez has been told that the goalkeeper won't come cheap. The Daily Mirror is reporting that a price tag of £10m has been quoted as Cardiff won't sell unless the offer is too good to refuse.

John Hughes has confirmed his interest in Celtic's Anthony Stokes and wants to partner the forward with Miles Storey. However, he revealed that there is competition for the player's signature.