Loose played as a sweeper between 1981 and 1986 for Borussia Dortmund, and also for a year for Rot-Weiß Oberhausen.

Ralf Loose replaced Rainer Hörgl as coach at FC Augsburg in October 2007.

Loose was sacked in April 2008, after a dismal season that has left Augsburg teetering close to relegation.

Loose was appointed manager of Swiss Challenge League club, FC Winterthur on 1 July 2019

This biographical article related to association football in Germany, about a defender born in the 1960s, is a stub.