Lookman scored the winner on debut against Borussia Monchengladbach last weekend.
Asked about his plans, the striker told Sportbuzzer: "Let me get here first and play football. I want to prevail in the Bundesliga, have fun, help the team and the club.
"No one knows what's going on in five months.
"I wanted a new challenge, a new league. The Bundesliga has a great reputation in England. Top stadiums, good, physically strong and disciplined players, a high level."