Chamberlain threw only 112 1/3 innings in his first professional season, 24 of which came in the Major Leagues, Cashman admits that the Yankees will be unable to slot Chamberlain into a five-man rotation without at least getting creative.

“Because of this stage in his development, he’s not going to be able to pitch for six months in the rotation without exceeding his limit,” Cashman said.

“If our entire staff is healthy coming out of Spring Training, he could go right to the ‘pen to start the season off. If we have injuries, he’d have to start the season in the rotation. It just depends how things are going to shake out.” (Source) 

I’ve said it before, Joba should start the year in the pen.