Morgan struck on tour of the US against Toronto FC.
"I think it was massive for Adam to be involved with the first team on this tour and it was brilliant of the manager to give him that chance," Fowler told liverpoolfc.com.
"As a goalscorer I think he's fantastic. I was lucky enough to train with him at the Academy last year when I was doing some coaching. He is very left footed and his finishing is very good.
"He is composed in front of goal and Rushie would tell you as well, if you are composed and patient in front of goal then you will have a chance.
"He never looks ruffled and that to me is a great sign regardless of what level you are playing at. He scored a goal against Toronto and that is a good sign.
"He's a young lad, he's got a lot to learn about his play outside the box but that will come. As a finisher he is probably one of the best I've seen for a long, long time to be honest."