Hughes is weighing up his options in the transfer market as he looks to improve a squad which flirted with a relegation battle last season before finishing six points clear of the drop in 13th.
Coates told The Sentinel: "It is early days. The manager is still settling in, but we have been pleased with what we have seen so far.
"Mark wants to have a good look at the squad. I don't think there will be huge changes, no doubt there will be some."