#1 Jesse Lingard missed sorely in attack

Jesse Lingard has been an important player for Solskjaer. He has played in a 'false nine' position, which allowed him to express himself. The likes of Anthony Martial and Marcus Rashford have played on the flank, which has allowed to exploit their pace. Even Romelu Lukaku played off Lingard at Arsenal, and to good effect.
Juan Mata tried to emulate Lingard but failed to have much impact. He lacks the work rate and constant running that Lingard provides, and the difference was visible. United improved after Lingard came off the bench, providing a link between the midfield and attack.
He did win a penalty for Paul Pogba to convert but United dropped points nonetheless. Solskjaer will surely have realized the importance of Lingard to his side, especially in his reinvented role. He won't be benching him much in the coming weeks.