Leonel Vangioni scored a stunning goal, Rogelio Funes Mori made it seven goals in his past five matches and Carlos Rodriguez also found the net, yet Mohamed was not pleased with the level of performance.
Abdelkarim Hassan scored Al Sadd's second goal - after Baghdad Bounedjah got their first - to give them hope and Mohamed insisted a similar performance against Liverpool in the semi-final will result in defeat.
"It was a difficult match and we have to flip the page, it's a new chapter now," Mohamed said at a news conference.
"We have to play better and perform better if we want to compete against Liverpool. Liverpool are a team that forces you to play better and top your performance.
"We have no other option. If we play like today we will not be able to defeat Liverpool, so we have to raise the bar."