"This game was different," he told the official site. "In the first half we should have scored more - maybe we [did] score more with the second goal disallowed and then we missed a penalty and had a few chances.
"We played some wonderful combinations so it was really good. But I was not too happy with the first 20 minutes, with the concentration level we showed. It's not bad, of course not. When you are 1-0 in the lead against a Championship side then it's not bad. But if we trust a little too much in our skills, it's not the best decision to make.
"The second half was a little bit lively and we were under pressure. Then, unfortunately, with the injury of Lucas we changed the formation to have Shamal as a striker - he did wonderful - and we scored a second goal. That was OK, but defending a little bit deeper we had to do it, and it was really hard for the players."
Liverpool now jet off to the USA to continue their pre-season preparations. The club's England players will join them for the training camp and the International Champions Cup games with Chelsea on July 27, AC Milan on July 30) and AS Roma on August 1.