Manchester United suffered a double blow during their 2-1 defeat to Arsenal in a pre-season match. Both Rasmus Højlund and Leny Yoro were forced off with injuries. The two players were substituted in the first half at SoFi Stadium. Højlund, who scored United’s opening goal, lasted just 13 minutes before going down with what looked like a muscle problem. The striker was able to walk off the pitch and headed straight down the tunnel. Yoro, a £52million summer signing from Lille, was substituted midway through the first half. The 18-year-old was limping as he headed towards the dressing room. Pre…