University of Arizona coach Lute Olson is set to announce his resignation, according to a report by ESPN on Thursday.

The school failed to confirm the report. ESPN also reported associate coach Mike Dunlap would be named interim head coach.

Olson missed a practice Wednesday and an appearance at a local Rotary club for health-related reasons, the Arizona Daily Star reported.

Olson?s decision to walk away will end a 25-year tenure with the Wildcats, whom he built into one of the nation?s elite programs.