The Danish Under-21 keeper started the season in goal for the Blues, keeping 4 clean sheets in 7 games, but has slipped back down the pecking order and has agreed to a one-month stint in south Wales, where he will link up with former Blues Robbie Fowler and Trevor Sinclair.
Eriksson dropped Schmeichel to give Joe Hart a chance to impress and although the England Under-21 keeper has done well in the last 4 games, Isaksson has returned to full fitness.
After being injured at the start of last season, Isaksson had to wait until February before becoming first-choice ahead of Nicky Weaver, and the Swedish number one has had poor fortune again this term, suffering a broken thumb in pre-season and then an ankle injury for Sweden.
I think Eriksson has done brilliantly to give both Schmeichel and Hart a chance while Isaksson was out injured, and then once they'd done well to keep them in the team.
Other managers might have just brought Isaksson straight back into the team, but Eriksson has taken the opportunity to give his young keepers some valuable experience and we can now be confident they'll both be quality keepers in the future.
Isaksson is yet to feature under Eriksson and the City boss knows he can only hold his compatriot back so long. He's vastly experienced having made 41 international appearances and at his best is one of the best keepers in Europe.
Isaksson is said to be getting frustrated with spending so long on the sidelines at City and having proved he has overcome his ankle injury with Sweden and City's reserves, Eriksson is set to welcome him back in next week's Carling Cup tie with Bolton.
"At this moment Joe Hart is playing and maybe Isaksson will play on Wednesday because at some point I must give him a chance to show what he can do," he said.
"He's very good in training and was number one here before I came and number one for the national team with Sweden. I feel that I have to give him the chance, so that means that Kasper, the third one at this moment, needs to play football.
"It will be very good for him to go on loan for one month to Cardiff and then after that we will see what is happening."