Gillingham midfielder Ethan Coleman is playing catch-up this pre-season. Manager Mark Bonner revealed that the 24-year-old has been struggling with an ankle injury since the players returned for training a fortnight ago. Coleman was missing for the Gills on Saturday in the game against Millwall but there is hope he can be back soon. “We are a little bit light in midfield,” said the Gills boss. “(George Lapslie) has got a bit of a tight quad so wasn’t available. Alex Giles filled in in midfield and did alright. Robbie McKenzie was in there because Ethan Coleman has got a bit of an ankle. “He is…