BSC Old Boys
Hauser made his debut for Sunderland coming on as a substitute for Marco Gabbiadini in a 2–0 League win at Roker Park against Hull City on 25 February 1989 in front of a crowd of 14,719, following a £200,000 transfer from BSC Old Boys. He went on to make four further substitute appearances until making his full debut against Chelsea F.C. in a 2–1 loss on 21 March 1989. Hauser's first goal came at Boundary Park in a 2–2 draw with Oldham Athletic, he scored one week later in a 2–1 victory against Shrewsbury Town at Roker Park.