The Finland international has scored nine goals in 21 Premier League matches so far this season.

Norwich remain rooted to the foot of the Premier League table, seven points adrift of safety, but are unbeaten in their last three matches ahead of the trip to Old Trafford.

Teenager Adam Idah scored a hat-trick in the 4-2 FA Cup third-round win at Preston in place of Pukki, but Farke was keen to exercise caution over the potential impact of the 18-year-old.

When asked whether Idah could feature, Farke said: "We will see.

"We are struggling a bit with injuries of our main striker options with Teemu Pukki and also Josip Drmic. And Dennis Srbeny has left us, so of course Adam Idah is a good option for us.

"Without any doubt he's done really alright at Preston in the cup game."

On the possibility of changing the playing system in the absence of Pukki, the Canaries boss said: "Well of course it's crucial when one of your key players is not available.

"It's the same even for Barcelona when Messi is not available. It's still a huge task for them, so even more for us without any doubt.

"But we are not relying on one player, so we can't change a whole philosophy and an idea of playing and how we want to work just because of one player.

"It can always be this player sometimes, could be an illness or injury, so it's quite important that all are prepared sometimes to play in our way when he's not available.

"It changes a bit in personnel terms because a player like Adam Idah or Josip Drmic – they are all different to Teemu and their movements are different. And their team-mates will have to adapt a bit more to the different style, but we won't change our style in general."