The summer signing is back in full contention for playing time after returning from an injury picked up a few days prior to the start of the league season.
He only made his first appearance in the top-flight on Sunday when Dusseldorf hosted Freiburg.
"I am in perfect shape," says Ampomah, as reported by Footballghana.
"I feel ready. If the coach needs me, I want to help.
"The coach is the boss. He decides. Of course you always want to be in the starting eleven as a player.
"If it is not so, you have to stay positive and be ready when you come in."
Ampomah joined Dusseldorf from Belgian top-flight side Waasland-Beveren on a three-year contract.
Last season, the 23-year-old made 30 appearances for Waasland-Beveren, scoring eight times and providing seven assists.
His big Bundesliga break could be on Friday when the Flingeraner play as guests to Hertha Berlin.