Blues coach Sir John Kirwan believes his side has plenty of maturing to do as professional rugby players.
The Blues can no longer make Super Rugby's top six, with a 34-13 loss to the Cheetahs in Bloemfontein seeing the Africans through to the playoffs for the first time in their history.
Kirwan says his young side needs to learn how to close out games.
"I think the most disappointing, reflecting now, was the Highlanders, where we just weren't professional enough to go down there and really do the job.
"And I think that's got a lot to do with young guys learning to be very good professionals.''