Mustafa ErMustafa Er is a Turkish football coach and former player.Professional careerA youth academy product of Bursaspor, Mustafa made his professional debut for Bursaspor in a 5-2 Süper Lig loss to Gaziantepspor on 20 March 1999. Mustafa transferred to Konyaspor from Bursaspor, becoming a stalwart in the midfield for the team.Managerial careerAfter his retirement from football, Mustafa became a youth coach at Bursaspor, and worked his way up to assistant manager. On 10 April 2018, Mustafa was appointed interim manager of Bursaspor after Paul Le Guen was sacked.