By Ewan Murray Manchester United return to pre-season action this Saturday when they face Scottish giants Rangers in a friendly match. The Red Devils may have just captured the signature of wonderkid Leny Yoro, but it’s not all smiles within the camp following a 1-0 defeat to Rosenborg during their first pre-season outing. Erik ten Hag launched a scathing attack on his side’s performance, with standards needing to improve swiftly. Next up is a trip across the United Kingdom to face Rangers at Murrayfield. The Glasgow outfit also lost their opening pre-season friendly against Ajax last time out…