"It's just about learning and gaining experience for further fights and the ultimate goal that we are looking at, which is to be the world champion one day," Parker said.
One of the notable aspects of Parker's later performances in 2014 was his patience and ability to follow the plans laid down for him by veteran trainer Kevin Barry.
"I think with all the fights we've had and all the experience I've been able to gain in the ring it's helped with my ringcraft and it's helped relax me as a fighter," he said.
Parker's busy 2015 will also include a stop in Austria in April where he will spar with Klitschko.
"It will be a great opportunity but I can't really look past this dude," Parker said of the bout with Pettaway. "If I can't beat this dude then sparring against the champ, he'll probably annihilate me."
Duco's David Higgins, who promotes Parker, said that while their prized asset fought on a Klitschko undercard last year, that was unlikely to be repeated when the Ukrainian giant makes a scheduled title defence, tipped to be against American Bryant Jennings, in New York on April 25.
"The purpose of sparring Klitschko is to get a gauge of where Joe's at in terms of the world's best," Higgins said.