Striker now set to miss Old Firm games – and potentially months of seasonRangers captain Lawrence Shankland is set to miss the Old Firm double-header against Celtic later this month after suffering a “significant” hamstring injury in the 1-0 win over Motherwell.Shankland was replaced just six minutes into the match at Ibrox after he pulled up clutching the back of his leg. He hobbled off and was replaced by fellow striker Ryan Naderi, who went on to score the only goal of the game.Shankland had scored three goals in his past two matches and was just starting to find his form with Rangers. The 31-year-old, who missed more than two months of last season with a hamstring injury while at Hearts, is now almost certain to miss the Premier Sports Cup tie at home to Celtic next Sunday and then the Premiership clash at Parkhead seven days later.Rangers captain Lawrence Shankland comes off early during the 1-0 win over Motherwell at Ibrox…