The San Francisco 49ers today announced they have signed TE Garrett Celek to a four-year extension.

"Since Garrett entered the league as an undrafted rookie free agent in 2012, he has displayed the skill, work ethic and desire to compete at a high level in the National Football League," said 49ers general manager Trent Baalke. "His commitment and determination to succeed are reflected in the way he conducts himself as a professional on and off the field. As an organization, we would like to congratulate Garrett and look forward to his continued development as a member of this organization."

Celek (6-5, 252) originally signed with the 49ers as an undrafted rookie free agent on May 4, 2012. He has appeared in 39 games (10 starts) over the past four seasons and registered 27 receptions for 328 yards and three touchdowns. In 2015, Celek appeared in 11 games, making a career-high eight starts, and registered 19 receptions for 186 yards and three touchdowns. Celek was placed on the Injured Reserve List on December 8 with an ankle injury.

A 27-year-old native of Cincinnati, OH, Celek played collegiately at Michigan State, where he appeared in 38 games (12 starts).