"We don't want to lose any of the players at the club. The ones I have spoken to have certainly intimated they'd like to play their part next year," said Coyle.
McCarthy (right) was given an extended break to allow for the time he spent on international duty with Ireland at the end of last season but he made an instant impact, scoring as a sub in a win over Columbus Crew in the US.
"It was hard for the first couple of days because the boys were ahead of me fitness wise, but I always keep myself in decent shape so I've just had to get my head down and work," said McCarthy.
"The gaffer seems really positive and you can see the energy he has and he's got everyone going. He's brought in a lot of boys quickly but they all seem to be a really great bunch and there's a spirit there already between everyone, all the new boys who want to prove something, and the boys who have been here a while who also need to make a good impression for the gaffer."