If the Rangers are going to add a starting pitcher this off-season, it will be done on a one-year basis to help keep a spot warm for one from a group of fast-moving pitching prospects who could reach the majors in 2014.

As such, a baseball source said that they have interest in former Cy Young winner Bartolo Colon, a free agent who went 18-6 with a 2.65 ERA last season for Oakland.

Colon, who will turn 41 in May, would push Alexi Ogando out of the rotation and keep Robbie Ross in the bullpen, an area of the club that is also undergoing change for 2014 with Joe Nathan off to Detroit.

Colon would also be insurance if left-hander Matt Harrison is slow to come back from two back operations in April and May and September surgery to thoracic outlet syndrome on his right side.