Malky Mackay has signed two players so far this summer and has given Filip Kiss a permanent contract.
Joe Lewis and Jordon Mutch are the two new arrivals and Cardiff are still strongly linked to Coventry's Richard Keogh and a return for Craig Bellamy.
“Of course you’d like everyone in by the start of the season, but the way things are that will not be the case and it’s the same at every club,” said Mackay.
“It could go right up to the deadline. It’s not ideal, but that’s the way it goes so I would urge a bit of patience from our supporters.
“Myself and my recruitment are working tirelessly to bring in the players we want and there are plenty of irons in the fire right now.”
The full squad returns this coming week for pre season training.