The win was the second in a row for Heynckes and with only three games left to play Bayern now trail Wolfsburg only on goal difference (two goals).
While Bayern will aim to score two goals more than their main title contenders, they are also aware that with four teams separated by just two points anything can happen.
"It was important to get all three points (against Cottbus)", said the club's General Director Karl-Heinz Rummenigge.
"I think it has never in the history of the Bundesliga been as tight at the top.
"It would be wise not to be too euphoric. We can be champions but we can also slip down to fourth."
Magath's outstanding playmaker Zvjezdan Misimovic and fellow midfielder Sascha Riether are doubtful for the game after picking up injuries against Stuttgart.
"Our starting position has not become any better now," said Magath. "But if we find our normal home rhythm we will also beat Dortmund."
