Celtic winger Davie Provan reckons the case for Neil Lennon to remain at the club is the "rational" one and that Dermot Desmond will recognise the manager's contribution to the Hoop's history before making a decision on his future.The boss has been under pressure after only two wins in the last eight games and this was exacerbated yesterday when influential fan group the Green Brigade were pictured holding a banner at Celtic Park calling for him to quit.It stated: "Save the ten - time to go,