Multiple reliable new sources are reporting that Celtic have submitted a concrete bid for David Datro Fofana. The forward remains under contract at Chelsea, but the opening offer has opened the door for discussions between the two clubs - though it is unclear at this stage whether the current bid will be enough to tempt them to part with a prized asset. Until a fee and conditions are finalised, the deal remains vulnerable to disruption - especially if Fatih Karagumruk SK, Charlton and Wolves decide to make a formal offer of their own in the coming days. Celtic have been strong going forward this season, with 11 goals scored in 7 games (1.57 per game). David Datro Fofana would give them depth and keep that attacking firepower going all season. Chelsea have also been linked with Santiago Gimenez, Marc Guiu and Conrad Harder while Celtic are reportedly monitoring Jesuran Rak-Sakyi, Marcelo Saracchi and Michel Ange Balikwisha. Follow us on Twitter @PlayerSwitchCom and get the latest Celtic transfer news and rumours direct to your feed.