Quickfire goals from Naby Keita and Diogo Jota had put Jurgen Klopp’s men in control, before Mohamed Salah’s hat-trick sealed a memorable game.
Rashford, who took to his Twitter handle on Wednesday night, admitted he had struggled to find the words following the loss.
“I can’t lie you haven’t heard from me on here because as a United fan I didn’t really know what to say after Sunday.
“I was embarrassed. I am embarrassed. Our fans are everything and you didn’t deserve that.
“We’re working hard to try and fix this. “We have to redeem ourselves”