Battling for a roster spot in training camp is nothing new for Zach Miller and he will be doing so once again in 2017 for the Chicago Bears.

Miller was the team's No. 1 tight end last season, but the additions of Dion Sims in free agency and Adam Shaheen in the draft means there is no guarantee the veteran pass-catcher will make the roster this season.

Injuries have plagued Miller's career ever since entering the league as a sixth-round pick of the Jacksonville Jaguars in 2009. He played in just four games in 2011 before going on injured reserve with a shoulder injury. The next offseason he tore his Achilles tendon and did not get onto the field in 2012.

After spending part of the 2013 season with the Tampa Bay Buccaneers, Miller signed with Chicago late in the 2013 season. In August of 2014 he went on injured reserve after suffering a foot injury in the preseason. The Bears thought enough of him to give him a one-year deal in 2015 and he caught 34 passes for 439 yards with five touchdowns in 15 games serving primarily as Martellus Bennett's backup.

Last season he assumed the role of starting tight end but another injury forced him to miss the final six games of the season. He ended the year with 47 catches for 486 yards with four touchdowns in 10 games.

Miller, when healthy, has been a reliable target in the middle of the field, but the Bears appear ready to move on from the veteran tight end.

"Despite his production when healthy, Miller probably needs to have a really good camp to stick," wrote Mark Potash of the Chicago Sun-Times.

Miller does not have a large cap hit this season, just a shade over $2.3 million, but keeping him on the roster could stunt the potential growth of a player like Shaheen or even one of Chicago's other young tight ends.

In addition to having Sims and Shaheen locked into long-term deals, the Bears also have a trio of young tight ends in Daniel Brown, MyCole Pruitt and Ben Braunecker set to battle for a roster spot.

The cards are stacked against Miller to make Chicago's roster but he has also proven in the past he can fight through adversity. Time will tell if he can stick on the roster through training camp.