Task: Explanation
Input (English): Roman Grill (born March 1, 1966) is a German former footballer who is now a player agent. A defender, Grill spent eleven years playing for Bayern Munich's reserve team, and made one first-team appearance, replacing Thomas Helmer in a UEFA Cup match against Benfica in December 1995. Bayern went on to win the competition that season. After retiring, Grill worked as a coach with Bayern's youth team, before starting his own player agency in 2006. His clients include Owen Hargreaves, Philipp Lahm and Piotr Trochowski. Question: Who is the German professional footballer who is the client of Roman Grill? Answer: Piotr Trochowski
Output (English):  His clients include Owen Hargreaves, Philipp Lahm and Piotr Trochowski.