Charlie Nicholas believes Neil Lennon will be left with sleepless nights regarding his team selection ahead of the crunch clash with Rangers.And the pundit reckons a midfield dilemma will have the Hoops boss tossing and turning ahead of the biggest game of the season.Celtic still have to get by Dundee United but Nicholas believes the crunch clash at Ibrox will already be looming large in the mind of the Irishman.The 58-year-old believes Scott Brown will start against Rangers but he believes an