Borussia Moenchengladbach admit the hunt to find a 'perfect' new coach could take weeks amidst the chaos caused by Lucien Favre's shock resignation and next week's visit of Manchester City.

Favre dropped a bombshell on Gladbach on Sunday by resigning as head coach, 24 hours after the club's 1-0 defeat at Cologne left them bottom of the Bundesliga without a point from their first five games.

They host Augsburg in the Bundesliga on Wednesday and Andre Schubert has been promoted from Gladbach's reserve team as caretaker, but the ex-Paderborn and St Pauli coach could get the job permanently if successful in the coming games.

The departure of Favre, who spent four years in charge and achieved Champions League qualification last season, has shocked Gladbach, who play Stuttgart away on Sunday, then City at home next Wednesday in the Champions League.

Former Borussia Dortmund coach Jurgen Klopp has already been ruled out of the running to replace Favre and Gladbach's sporting director Max Eberl admits the hunt to find a replacement could last weeks.

"It may be that it will take until the winter. This we cannot, and will not, rule out," said Eberl on Tuesday.

"We must try and find a perfect new coach, but we don't want a Lucien Favre clone."

Schubert is now tasked with dragging Gladbach up the league table and avoiding humiliation against City, who lost 2-1 at home to Juventus the same night Gladbach were beaten 3-0 at Sevilla on September 15.

Eberl admitted Schubert could find himself in the job permanently if things go well.

"I've learnt that it's difficult to make concrete statements in football," added Eberl, when asked if Schubert, who also coaches Germany's Under-15 team, will definitely be replaced.

Markus Weinzierl, who took charge of mid-table Augsburg in 2012 and, after Favre's departure, is now the longest-serving Bundsliga coach, expects Gladbach to come out fighting on Wednesday.

"Basically, Gladbach are a very, very good team, who have a lot of quality and lots of potential," said Weinzierl.

"(Andre Schubert) is a good man who has an insight into the team and brings influences from outside.

"This makes the game all the more dangerous."