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Barcelona are the best in the business - but it is Borussia Monchengladbach who are giving Pep Guardiola sleepless nights ahead of Manchester City's Champions League campaign.

The Blues boss has admitted that the draw for the group stage has given him cause for concern after his team were placed with Barcelona, Borussia and Celtic.

City face Borussia at the Etihad Stadium in the opening group game, just three days after the Manchester derby.

The Blues did the double over Borussia in last season's competition, winning 4-2 in Manchester and 2-1 in Germany – but both games could easily have gone the other way.

Guardiola, who came up against the opposition in his three seasons with Bayern Munich, told Radio Catalunya: “I'm worried about Monchengladbach.

“I know them very well. The Champions League starts in the first round and not in the knockout stages. You cannot make mistakes. If you relax in the first two games, you are out.”

The fact that City also drew Barca, who knocked them out in the last 16 in 2014 and 2015, makes it a big ask for Guardiola's team, and he thinks Lionel Messi, Luis Suarez and Neymar make it the hardest test imaginable.

He said: “We will play against the best. Nobody plays better than Barca.

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“The three players up front make the difference but there is also a lot of work that goes at the back.

“You can see in the way they play that work has been done at the back and is what Luis Enrique has done and will continue to do in the coming years.

“They are the best and it's a great test for us. We will see what level we will give.”

Is Pep right to worry about Gladbach? Have your say below