Wes Welker has enjoyed an improbably successful 12-year career in the NFL. Welker, an undrafted free agent, spent two seasons with the Miami Dolphins before revolutionizing the slot receiver position with the New England Patriots. Needless to say, not many expected the 5-foot-9, 185-lb receiver to have such a significant impact on the game.

However, Welker has dealt with severe concussion issues in recent seasons, and it's unclear if he'll return for an 13th go around in the NFL.

As of right now, not even the 35-year-old receiver knows what he's planning to do.

"I'm weighing my options and really trying to figure out where to go with life next," he said in a recent interview. "There are some days I wake up and I'm like, 'Ok, I'm done.' And other days I wake up and I'm like, 'Oh, maybe one more year.'"

Welker did not sign with a team in 2015 until the St. Louis Rams added him in November. He appeared in eight games with the team, catching just 13 passes for 102 yards. It's possible that Welker takes a similarly long time to decide his future this year, as well.

"I'm trying not to rush into any decision, but at the same time, know that and prepare myself for not playing," he explained. Welker added that his history of head injuries - he suffered three while with the Denver Broncos - will "definitely" factor into his decision.

In 2014, Welker appeared in 14 games for the Broncos, catching 49 passes for 464 yards and two touchdowns.

Welker ranks 20th all-time and sixth among active players with 903 career receptions. Only Brandon Marshall (six) has recorded more 100-plus catch seasons than Welker (five) in NFL history. For his career, he has posted 9,924 receiving yards and caught 50 touchdowns.