Brentford's squad are putting the ongoing Scott Hogan transfer saga to the back of their minds.
The striker has been the subject of three bids from West Ham, all of them rejected as the Bees want £15million for their leading goalscorer.
The Frenchman said: “We're just getting on with it. It'd be good for him if he can have a Premier League club but we focus on our job.
“We have to focus on Newcastle. We'll stay focused and we did well as in the cup it can be a hard game. We respected the opponent by scoring five goals in the game.”
The centre back knows how good a player Hogan is and was amazed by how the striker came back from 18 months out of the game with two anterior cruciate ligament injuries.
Barbet added: “He's a good player. He was injured for two years, came back and scored 14 goals in 24 games. It's unbelievable. I hope he can keep going in that way and see what happens.”
In Hogan's absence, the Frenchman was on penalties and duly scored and is open to staying on spot kicks. The striker has missed both of his penalties in his Brentford career.
Barbet explained: “I said if we have a penalty I'll take it. I had one and scored. We'll see if I'm on penalties in future.”