Ex-Celtic striker Chris Sutton has rightfully slammed Rangers for their alleged request asking referee Willie Collum not to officiate in any of their games in the future. The Ibrox club were incensed after their Glasgow derby defeat to Celtic last weekend, as Brendan Rodgers ended Philippe Clement’s unbeaten start as Rangers manager. They feel Alistair Johnston should have been penalised for a handball and thus be awarded a penalty. However, VAR on the day Collum did not feel a clear and obvious error was made by on-field referee Nick Walsh and thus play continued. Regardless, it was later con…