Borussia Mönchengladbach full back Stefan Lainer has said he is happy to be playing again after months of treatment for lymphoma which was diagnosed in July. Lainer played for half an hour in Gladbach’s 3-2 win over Dutch side Go Ahead Eagles in a friendly on Saturday, and he set up the opening goal from Alassane Plea. “It felt very good even though it was just for 30 minutes. I didn’t feel any real strength deficits. We have worked very well over the past weeks,” Lainer said. The club announced his illness in late July, saying the cancer was detected at an early stage and was treatable with m…