The Bears on Saturday promoted receivers Josh Bellamy and Chris Williams and center Taylor Boggs from the practice squad in advance of Sunday night's game against the 49ers.
To make room on their roster, they waived quarterback David Fales and terminated the contracts of fullback Tony Fiammetta and nickel back Kelvin Hayden.
Bellamy originally joined the Bears April 8 when he was claimed off waivers from the Redskins. He led Chicago receivers with 140 yards on seven catches in the preseason.
"I recall that when he had some opportunities he made some plays," said coach Marc Trestman. "The last [preseason] game he made some plays, he showed some speed and did some good things."
Bellamy has appeared in eight NFL games, all as a reserve, in two seasons with the Chiefs (2012), Chargers (2013) and Redskins (2013). He averaged 20.2 yards on five kickoff returns with Kansas City in 2012, but has yet to catch a pass in a regular-season game.
Williams was signed by the Bears off the Saints' practice squad prior to last year's season finale. Before joining New Orleans last October, he spent three seasons in the CFL with the Hamilton Tiger Cats, setting a league record with six return touchdowns in 2012.
In the preseason, Williams caught four passes for 94 yards including a 73-yard touchdown and averaged 27.0 yards on three kickoff returns.
Boggs was active for all 16 games with the Bears last season, but he appeared in only one contest. The 6-3, 285-pounder spent the previous two seasons with the Jets after signing as an undrafted free agent from Humboldt State, but he did not appear in a regular-season game.
Fales was selected by the Bears in the sixth round of the draft out of San Jose State. In preseason action, he completed 18 of 31 passes for 214 yards with one touchdown, two interceptions and a 63.1 passer rating.
Fiammetta appeared in all 16 games with seven starts for the Bears last year.
Hayden was inactive for the season opener. He appeared in all 16 games with two starts for the Bears in 2012, recording 40 tackles and one interception, before missing all of last season with a torn hamstring he sustained in training camp.