Who is the German professional footballer who is the client of Roman Grill?
Roman Grill:  His clients include Owen Hargreaves, Philipp Lahm and Piotr Trochowski. Piotr Trochowski: Piotr Artur Trochowski (] , ] ; born 22 March 1984) is a German professional footballer who plays as an attacking midfielder and is currently unattached to a club.
Piotr Trochowski