Braun Strowman was not on Raw last Monday night because WWE is trying to make a huge effort to keep the physicality between him and Brock Lesnar to a minimum before their colossal match at WWE No Mercy in September.
Next week on Raw, Strowman is scheduled to be back, while Lesnar is scheduled to be missing the show so that there will be no confrontation there either. However, the week after that, both wrestlers are scheduled to be appearing on the show together.