After two seasons as manager with Braunschweig he departed from the club, taking over Hansa Rostock in East Germany's NOFV Oberliga Nordost, previously known as DDR-Oberliga.

Under Reinders guidance Rostock won the final edition of the East German Cup (against FC Stahl Eisenhüttenstadt) and also grabbed the NOFV Oberliga Nordost title, which meant the team qualified to start in the Bundesliga in the 1991–92 season.

Enjoying a fantastic start to the 1991–92 season, Rostock's form slumped massively and, with the threat of relegation rising, let the club sack him on 6 March 1992.

Just a month later he was back in charge of a Bundesliga outfit, successing Willibert Kremer at fellow relegation threatened MSV Duisburg.

FC Pforzheim, and then Brinkumer SV, a club promoted to the fourth tier of German football, Oberliga Nord, at the start of the 2005–06 season.