For Carrick's winning debut against Manchester City, Cunha started on the bench and created Patrick Dorgu's goal after entering the fray in the second-half.
"It's big," Carrick replied, when asked about Cunha's professionalism in making such an impact off the bench. "It's big. I think the disappointment, obviously, for all the boys who didn't start the game.
"You know, coming on and making a difference and feeling it. Whether that's actually making a difference, and that's something we spoke about this week, making a difference on the pitch or from the sidelines, or from the changing room. I've seen the boys supporting in the Directors' Box and celebrating the goal.
"For me to see that attachment, the connection from everybody, is huge, moving forward.
"Matheus, you know, made a big impact when he came on," added Carrick.
"The goal, obviously, but in terms of how he went about the game. I was delighted with him.
"Again, it's something, moving forward, for everyone to feed off and that goes a long way."