Boss Gary O'Neil insists Wolves must maintain their focus after booking an FA Cup Black Country derby against West Brom.

Matheus Cunha's penalty saw off Brentford 3-2 after extra-time and sent O'Neil's men into the fourth round.

Nelson Semedo and Nathan Fraser twice hit back for the hosts after goals from Nathan Collins and Neal Maupay in an entertaining replay.

And Wolves now go to The Hawthorns on January 28 for the first Black Country derby in three years — and the first with fans in attendance since 2012.

O'Neil, 40, said: "As soon as we walked off I was thinking about Brighton [in the Premier League]. 

"I understand fans will be excited, it will be a big atmosphere, it hasn't been played with fans for a while.

"I can't wait to lead the team down there and see if we can progress again but there's a Premier League game coming up and I have a very small, tired group to do some work with before we go to Brighton.

"I have mixed feelings about the performance but I'm delighted with the win. The lads have worked unbelievably hard over the two ties. 

"We've talked about taking the FA Cup seriously, we went down to 10 men at Brentford and tonight got a bit awkward for us.

"The players deserve credit for how they have approached the whole tie."

Brentford boss Thomas Frank revealed he cannot wait to welcome star Ivan Toney back into the ranks this weekend after a run of no wins in seven matches.

Toney's eight-month ban for gambling offences ends on January 17 and he is available to line up against Nottingham Forest on Saturday.

Frank said: "It's massive, no doubt. It's like signing a Premier League striker who can score 20 goals.

"Every team would be happy to sign a quality player like him. Ivan is a top player but he's also very good at making the whole team better."