Fosu-Mensah was sold by Manchester United to Bayer in January.
Younger brother Paul Fosu-Mensah is currently playing in the Eerste Divisie with Helmond Sport, having attempted to break into English football at Fulham.
Paul said of his older brother: "If you can make your debut against Arsenal at the age of eighteen at a full Old Trafford… That's not something everyone can say. Phew, I sat with a pounding heart when he stood on the sidelines.
"I still have those moments sharp in my memory."
He continued to Voetbalzone: “You always walk around with that. I'm just proud. My brother has played in the Premier League and now plays in Bundesliga. I just always try to show myself, do my best and show my qualities. What the people think has relatively little influence. I live from day to day, but of course I have ambitions."
Paul and Timothy's older brother Alfons is playing in England for Glossop North End.
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