Brentford head coach Thomas Frank believes that Wednesday night's clash with Manchester United could be the 'most difficult game of the season.'

The Red Devils are in the race for Champions League qualification, despite a 2-0 defeat to rivals Newcastle United on Sunday, and Frank explained why he thinks Erik ten Hag's side could be dangerous at Old Trafford.

“We are potentially going into the most difficult game of the season, with everything taken into consideration”, Frank said.

“We are going away to the biggest away ground, with those fans, against a very good side that are much more stable.

"Erik ten Hag and his staff have done a very good job. They’ve just won their first trophy and they’re fighting for a Champions League spot. 

“They lost [on Sunday] so they will want to bounce back. Plus, we beat them last time, so they’ll doubly want to bounce back. 

“And they’re a very good team with top players.” 

Frank added: “I know it will be unbelievably difficult tomorrow. They will come flying out and fighting for every single ball.

“They’ll be showing unbelievable determination, they’ll be on top of everything, and their skillset is absolutely frightening when you look at the players they have in their squad. 

“It will be difficult but, of course, we believe in ourselves that we can do something.” 

Frank was asked about Brentford's 4-0 victory over United earlier this season, but the Bees boss is well aware that it holds no bearing on our upcoming clash with Ten Hag's side.

"That was a very, very good win in the history of Brentford," Frank responded. "I don't want to run away from that - we are very proud of that.

"But we know it will be a completely different game on Wednesday night.

"It's a big credit to Manchester United's history and what they've achieved when you look at how much that win meant to us.

"That's what comes when a club has done fantastically over the last 30 years, with that golden era and when they won everything under [Sir Alex] Ferguson.

"When you have those expectations and you lose a game, it's a bit disappointing. That's the way it is. That's huge credit to them - for us to beat them is a big thing.

"But that's history, we can't use that for anything on Wednesday night. That was a completely different game."