The former Red Devils shot-stopper told talkSPORT: “For me, I’m sorry, but that wasn’t a foul.
United did level matters through former Blades defender Harry Maguire, but Oliver Burke struck a deflected winner to secure the Premier League’s bottom club a notable scalp.
Bosnich believes Solskjaer’s side, who could have gone back to the top of the table with a win, “underestimated” their opponents, with the wrong mindset adopted in what was always going to be a potential banana skin.