Solanke, 19, made his Reds debut in the 4-0 win over Tranmere at Prenton Park which kicked off pre-season for both clubs.
Asked if the young forward would be part of the first team squad, Klopp said: "He decides that himself. Obviously he is a young lad and it is a long-term project. I have all the time in the world.
“If he brings a little bit 'rush' with his development then everything is good. I saw a few wonderful signs tonight and I think everyone in England watched the U20 championship that was fantastic football.
“He is a really skilled boy but he has to improve of course. But a lot of things are already really good: first touch, movement.
“It is about him and the situation but I will not avoid his development. In the moment when he is strong enough he is there.
“He will train with us, of course, as often as it makes sense and often as possible and then we will see."