The ambitious manager is keen to continue reinforcing ahead of the Premier League kick-off, following Saturday's club-record capture of midfielder Gary Medel from Sevilla
The Scot has been busy in the close-season ahead of the club's first Premier League campaign, making five new additions and smashing their transfer record three times.
|2/5||Cardiff City are 2/5 with Bet365 to avoid relegation from the Premier League
"We're still looking and trying but it will only be players I feel that are going to improve the group," he told BBC South East Wales.
"Like everyone else, with three weeks still to go in the window, [we are] looking to see if there's anyone that can improve our squad.
"We've got various irons in the fire at the moment and they're all moving along and progressing at different levels.
"If we could at least get another two, then that would help."
The Welsh club have had a good pre-season, going unbeaten in four of their five friendlies, but they will have a significantly harder time when they face West Ham away in the league opener on Saturday.