Walsall-born Roberts, who forced his way into the starting line-up last season after ousting then first choice Mark Gillespie, insisted that both he and Dunn are working hard to get the nod for the season-opening clash with Plymouth Argyle.
Roberts also discussed the Saddlers' pre-season campaign, admitting that the sun-drenched sessions have been tough but enjoyable, and have given the players opportunities to impress the manager, but all he wants to do is get the season underway.
Speaking via the Express & Star, Liam said; "He is a really great guy and is really positive and always works hard. That is exactly what you want. He has done well in pre-season and now it’s up to me to impress and be better than him.
"We are in the exact same situation, ultimately he wants to play against Plymouth on the opening day. It’s really good competition. We have got the goalkeepers union but the competitiveness is there. Both of us are working really hard. And we are only going to improve one another."
The stopper then went on to talk about the upcoming League One campaign, where he admitted gthat he is itching to get the season underway, he continued; "There are some positive vibes at the club he and we have been working hard in training to get little things tied down ready for the season.
"I’m itching to get on with it now. You have pre-season and play games and you try and impress the gaffer and the coaching staff to get into the team for the first day. You do your pre-season training which is tough but enjoyable. But the aim is always to be winning a place in the team for the opening day."