Chris Barker missed the trip due to a family bereavement.
Cardiff City World reports that Layton Maxwell, Fan Zhiyi and David Hughes have stayed behind training at Ninian Park with physio Jimmy Goodfellow.
The other senior City members missing are those in international duty this week.
Robert Earnshaw, Rhys Weston, Steve Jenkins, Lee Fowler, James Collins and Neil Alexander.
Andrew Jordan played for the reserves at Bristol City this afternoon.
"This is a serious training camp and not relaxation" Lennie told the Echo.
"There will be the oportunity for a game of golf and the players will be able to relax on the last night, but we are here to work and prepare for the run-in to the end of the season."