Carlos Javier Grossmüller (born 4 May 1983) is a Uruguayan football manager and former player who played as a midfielder.

[1] Born in Montevideo, Uruguay, Grossmüller began his footballing career in 1988, at the age of five, as a youth player with his local team, Ombu.

In 2002, he made his professional debut for Primera División Uruguaya side Danubio, making mostly substitute appearances for the next two seasons, but being part of the 2004 championship team.

In 2004, he was sent on loan to Centro Atlético Fénix to gain experience, where he made six appearances in the Segunda División Uruguay before going back to Danubio.

During the next two seasons at Danubio, he went on to play 52 league games, netted 13 goals, and won two more titles, (2006 Apertura, 2007 Clausura) which prompted interest from German side Schalke 04.