Wolfsburg midfielder Luiz Gustavo has resumed team training ahead of a crucial week with matches against Borussia Dortmund, Manchester United and Hamburg.

Gustavo, 28, underwent knee surgery in June, missing the summer's Copa America with Brazil as a result.

He returned to the Wolfsburg squad near the beginning of the season, but has only completed eight matches since then because of ongoing fitness problems.

Having missed Wolfsburg's 0-0 draw at Augsburg last weekend, Gustavo resumed team training on Wednesday and could be back in the squad for the match with Dortmund on Saturday.

"Luiz can compensate a lot with experience, but he also needs to be mentally ready," Wolfsburg coach Dieter Hecking told kicker, leaving it open whether he will be involved against Dortmund.

Away from home, Wolfsburg have failed to impress this season, managing only one win, three goals and six points from seven matches in the Bundesliga.

At the Volkswagen Arena, however, the club have gone unbeaten in 29 league games, with their last loss a 6-1 defeat against Bayern Munich in March 2014.

Luiz Gustavo is back in training for Wolfsburg. PATRIK STOLLARZ/AFP/Getty Images

Third-placed Wolfsburg will be looking to close the gap on second-placed Dortmund when they face them on Saturday, while a draw against Manchester United on Tuesday would be enough to secure qualification for the Champions League knockout stages for the first time in their history. They then play seventh-placed Hamburg in the Bundesliga on the following Saturday.

And with Julian Draxler returning from suspension in the Bundesliga, Hecking has all of his key players available for the crucial week ahead -- the first game will be his 100th as Wolfsburg coach,

"It's clear that they all want to be part of it," Hecking said, adding that he felt "pure enthusiasm" when watching his players on the training pitch.

Wolfsburg striker Bas Dost added in Wolfsburger Allgemeine Zeitung: "It does not matter whether we play away or at home, but it's just a wicked feeling in front of our own fans. Getting three points [against Dortmund] will be important."