"Jonathan Woodgate's arrival will mean more competition for me," he told the Sunday Sun.
"If the club think that's the right signing, then great. I'll have to battle him for a place or play alongside him.
"If I play alongside him, I'll be happy. But if I'm not in the side then I'll not be happy and this may not be the place for me.
"I'm 22 and I'm not going to sit it out any longer. I've waited, I've been patient and I've seen a lot of players come and go and it's getting to the point now where I've got to play.
"I know I'm good enough but if I'm not playing here I'll have to look to go somewhere else to prove myself. I'm not going to be a ten games a season player any more."
Caldwell has mostly performed well when called upon this season and his frustration at the situation surrounding his contract is understandable, but he also seems to have had a lot to say for himself in recent weeks.
Sir Bobby is pretty unlikely to be swayed by anything Caldwell says to the press and will judge him solely on his performances on the pitch.
I for one hope that he does earn himself a new deal because he looks to be a promising player, but if Sir Bobby decides that Woodgate, Aaron Hughes and Titus Bramble are better players then so be it.
At this stage it would be no great surprise to see Caldwell turning out for Rangers next season.