Hughes took his first training session as the squad returned from their summer holidays.
They will undergo fitness testing at St George's Park on Tuesday before jetting off to France on Wednesday for a five-day training camp.
Only two of his players remain away - Trinidad and Tobago striker Kenwyne Jones and United States winger Brek Shea are involved in the CONCACAF Gold Cup.
Hughes, who took over at City following the dismissal of Tony Pulis last month, told the club's website: "First impressions have been good.
"But first and foremost, I've been really pleased with the attitude and application - I think that's really important because if you've got a good group you can put things to them and try and work with them.
"It has all been very positive so far. We've got a day of testing and then we're off to France for four or five days, which will help myself and the staff get to know the players and them to get to know us."