 After one year in Basel, Muff was aggressively loaned in 2001 to FC Lucerne and AC Lugano, before he returned to Basel.He was again on loan for the year 2002 to FC Lucerne and then loaned to FC Zürich in 2003.When his FC Basel contract expired over summer 2004, Grasshopper Club Zürich signed Muff for €1 million, bringing him back to the club where his career began.