RB Leipzig goalkeeper Peter Gulacsi suffered a severe knee injury in Wednesday’s 3-1 Champions League win against Celtic and will be sidelined for months. “Our captain sustained an anterior cruciate ligament tear in his right knee and will be out for a lengthy period of time,” Leipzig tweeted. “Further examinations will follow in the coming days.” Hungary international Gulacsi sustained the injury early in the game when he got stuck in the turf and was taken off after lengthy treatment. He was replaced by Janis Blaswich who is also set to be between the posts for the next months. “It really hu…