Guardiola said: "It's a little bit of a problem really because we don't know. Even when you have just one game for a manager you can have an idea.

"Of course we have some info about what he's done at the under-23 (level), but it's completely different.

"We don't know how he will play, what system, whether they will play long or short balls, whether they will go four in the back, five in the back, one striker or two strikers, high pressing or low pressing... we don't know anything exactly.

"We will have to immediately adapt after five or 10 minutes. The players will have to understand exactly what is going to happen with the game and adapt as quickly as possible."

Notwithstanding that, given current league positions and form, City will be overwhelming favourites.

Guardiola's champions are in another title race while Huddersfield are bottom of the table, eight points off safety having lost eight of their last nine games, the other being last week's goalless draw at Cardiff.

But despite their recent run, Guardiola was keen to pay tribute to Wagner, who lifted Huddersfield from the lower reaches of the Championship to the top flight.

He said: "First of all, a big compliment to Wagner for what he has done in the club – 40 years not in the Premier League and then promoted and an incredible season last season. He did an incredible job."

Guardiola, who took a year out of management after leaving Barcelona in 2012, can understand why the German felt the need to take a break but he expects him to return.

He said: "I understand completely. We feel a lot of pressure – all the managers feel that.

"But I am pretty sure he is coming back. Our job is so addictive too. When you take a break you realise how good you can do it and you want to come back. Everyone feels that situation."

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