[1] Wollitz was head coach of KFC Uerdingen from 1 July 2002 to 30 June 2004.

[4] Wollitz was head coach of VfL Osnabrück from 1 July 2004 to 30 June 2009.

[6] During the 2004–05 season, Osnabrück finished fourth in the Regionalliga Nord[7] and were eliminated in round two of the German Cup by Bayern Munich.

[8] The 2005–06 season started with wins against Fortuna Düsseldorf and Wuppertaler SV and draws against Rot-Weiß Oberhausen and the reserve team of Bayer Leverkusen.

[9] Then on 21 August 2005,[9] Osnabrück defeated Greuther Fürth in a shootout round one of the German Cup after finishing extra time 2–2.

[12] In the 2006–07 season, Osnabrück defeated Eintracht Braunschweig[13] and Borussia Mönchengladbach[14] to get to the 16th round in the German Cup where they were eliminated by Hertha BSC.

[15] The league season started on 8 August 2006 (matchday two) with a 1–0 win against Fortuna Düsseldorf.

[17] They finished the 2007–08 league season in 12th place[18] and were eliminated from the German Cup in the first round after a 1–0 loss to Borussia Mönchengladbach.

[20] They finished the season in 16th place[21] and lost both legs of the relegation playoff 1–0 to SC Paderborn 07.

[23] They were eventually eliminated in round two of the German Cup after a 4–2 extra time loss to TuS Koblenz.

They defeated TuS Heeslingen,[26] SC Freiburg,[27] VfL Wolfsburg,[28] and 1899 Hoffenheim[29] to get there.

[49] On 18 May 2021 it was announced that Wollitz would once again manager Energie Cottbus starting on 1 July 2021.