Chelsea are interested in signing Celtic striker Moussa Dembele – but it may cost them £40m to secure the player.

Sky sources understand Celtic are extremely reluctant to sell before Tuesday’s transfer deadline and would not consider a bid below £40m.

Dembele’s progress has been monitored closely by the Blues going back to his time at Fulham, when he was also of interest to Tottenham and almost signed for Spurs in January 2016.