Update (5/4/17, 3:39 p.m.): The 49ers have signed six of 10 draft picks along with 18 undrafted free agents.
SANTA CLARA – The 49ers are reportedly adding a fourth quarterback to their 90-man roster.
Nick Mullens a four-year starter at Southern Mississippi, agreed to terms with the 49ers after the conclusion of the Saturday’s NFL draft.
The 49ers reached agreements on the mandatory three-year, non-guaranteed contracts with 18 undrafted rookies, NBC Sports Bay Area confirmed. The club is expected this week to release some players currently on the offseason roster to make room for the rookies on the 90-man roster.
Mullens posted a drawing on Twitter from his childhood of "Joe Montana, Football Star." He wrote, "I've known about the
@49ers since 2nd grade & now I can't wait to be apart of the organization! Ready to get to work in San Fran."
Draft picks, players who sign as undrafted rookies and other rookies invited for tryouts are scheduled to report Thursday for the 49ers' rookie minicamp. The contracts will officially be signed as the players report for the minicamp. Practices will be held Friday, Saturday and Sunday.
As a senior, Mullens (6 foot 1, 196 pounds) completed 65.5 percent of his passes for 3,272 yards with 24 touchdowns and 11 interceptions.
Mullens joins a quarterback group that includes starter Brian Hoyer, backup Matt Barkley and third-round draft pick C.J. Beathard.
The other confirmed 49ers free-agent agreements are:
--TE Cole Hikutini, Louisville: He began his career with one-season stints at Sacramento State and City College of San Francisco before transferring to Louisville. Hikutini (6-4, 247) caught 50 passes for 668 yards and eight TDs in his final college season. Hikutini missed the Cardinals’ bowl game, the Senior Bowl and combine workouts due to a knee injury. He returned from the non-surgical injury to run at his pro day. Hikutini announced his signing with the 49ers via Twitter.
--DB Lorenzo Jerome, Saint Francis (PA): Jerome, a Senior Bowl invite, was named first-team FCS All-American. He intercepted six passes in 2016 with 59 tackles, 5.5 tackles for loss and 11 pass break-ups. He added a touchdown on a kickoff return. ESPN draft analyst Todd McShay ranked Jerome as the top undrafted player. Saint Francis announced the contract agreement.
--RB Matt Breida, Georgia Southern: In three seasons at Georgia Southern, Breida rushed for 3,740 yards and 37 touchdowns while averaging 6.9 yards a carry. Georgia Southern announced Breida's decision to sign with the 49ers.
--OL Erik Magnuson, Michigan: Magnuson (6-6, 305) was a first-team All-Big Ten performer who started every game at right tackle. He announced on Twitter that he has agreed to terms with the 49ers.
--WR Kendrick Bourne, Eastern Washington: He caught 211 passes for 3,130 yards and 27 touchdowns in his four-year career. Bourne (6-1, 203) had his best season as a senior, with 79 receptions for 1,201 yards and seven touchdowns. Eastern Washington announced Bourne’s three-year contract.
--OT Darrell Williams Jr., Western Kentucky: Williams (6-5, 315) started 41 games. He played his final two seasons at right tackle after moving from right guard. Western Kentucky announced the contract agreement with the 49ers.
--WR KD Cannon, Baylor: Cannon caught 195 passes for 3,113 and 27 touchdowns in his three-year career. He turned pro after a junior season in which he caught 87 passes for 1,215 yards and 13 touchdowns. He announced his contract agreement with the 49ers via Twitter.
--WR Victor Bolden, Oregon State: Bolden played four seasons at Oregon State, catching a total of 170 passes for 1,863 yards and seven touchdowns. Bolden (5-8 ¾, 178) ran 4.54 seconds in the 40-yard dash at the combine. (Bolden via Twitter)
--LB Jimmie Gilbert, Colorado (Colorado Football)
--OL J.P. Flynn, Montana State (Flynn via Twitter)
--DE Noble Nwachukwu, West Virginia (@WVUSports247)
--LB Donavin Newsom, Missouri (Columbia Daily Tribune)
--OL Bret Treadway, Lamar (Treadway via Twitter)
--FB Tyler McCloskey, Houston (Houston Chronicle)
--S Malik Golden, Penn State
--OL Evan Goodman, Arizona State
--DB Zach Franklin, Washburn