Norwich head coach David Wagner admitted he would be having words with Borja Sainz, whose early red card potentially cost his side in the 1-0 Championship defeat against West Brom at The Hawthorns.

Winger Sainz was sent off in the 34th minute for two bookable offences within five minutes – the second for a needless dissent – after twice going close to giving the Canaries the lead.

Brandon Thomas-Asante’s 50th-minute goal sealed the points for the Baggies, who cemented their place of fifth in the table

“When you’re on a booking, you can’t ask for another yellow,” said Wagner, whose side lost their five-match unbeaten run as a result.

“Everyone knows this – this rule has not been since yesterday and this rule exists all over the world.

“So it’s something you can’t do, especially if you’ve been booked and this is why – even if it’s a harsh decision – it was the correct decision and there is no one to blame but Borja himself.

“I have to speak with him and I will do, for sure, but officially and not in public.

“If he takes what’s right out of this situation – and I’ll make sure he takes what’s right – it will be another step in his progression.

“We’ll support him but it’s my job to speak about the truth as well.”

Wagner stopped short of saying the dismissal cost Norwich the game, but it made for a change of plan at half-time.

“On one side, yes it changed the game and cost us the game, but on the other side, it doesn’t mean that you are automatically not without an chance,” he added.

“I said at half-time: ‘Is it difficult? Yes, super difficult. Is it possible? It is, so let’s go for it’.”

West Brom wasted chances galore before Thomas-Asante’s winner, with John Swift missing six openings, including hitting the post and missing a kick in front of goal.

But Norwich could have snatched an equaliser but for goalkeeper Alex Palmer keeping out substitute Ui-Jo Hwang’s shot in the 77th minute.

West Brom head coach Carlos Corberan felt his side were on top, regardless of the sending off.

“The result was fair, from the way the game was going against 11 players and the way it went when we were against 10,” he said.

“I know the group wanted to take responsibility when they think something hasn’t gone well and we never want to make excuses.”

Thomas-Asante has now eclipsed his Albion tally of seven goals last season and Corberan felt the striker was back to his best.

“I wanted to see a reaction from the previous game because in the last game, I didn’t see his real level,” he added. “Today I saw him competing much better.

“I think sometimes – depending on the context of the game – it switches towards the advantages of one player.

“He’s not good at every single thing, but the important thing for him is to know what type of striker he is and play with the maximum mentality that he needs to play with.”