The deal swaps two young defensive players who had fallen out of favor on their original teams.
Middlebrooks, the Broncos' first-round selection in 2001, was a
disappointment in Denver, never earning a regular starting job in
four seasons. He will join Ahmed Plummer and Shawntae Spencer in
the 49ers' improved defensive secondary.
"It's my hope that he would at least be a third ... corner for
us," 49ers coach Mike Nolan said. "We're hoping he competes for
the second, even the first spot. We haven't had a lot of durability
at the position, as well as continuity."
Middlebrooks faces misdemeanor charges of third-degree assault
and harassment in the Denver suburb of Aurora, stemming from an
alleged fight with a female friend early on New Year's Day. A trial
is scheduled for Oct. 11, but Nolan said the 49ers had no qualms
about Middlebrooks' character.
"He certainly made a bad choice in the one incident, but he
certainly had no [negative] record prior to that," Nolan said.
Engelberger, a second-round draft pick in 2000, led the 49ers
with six sacks last season, but was thought to be too small to play
defensive end in San Francisco's new 3-4 scheme. Free agent Marques
Douglas was signed in April to take Engelberger's starting job, and
Engelberger missed the 49ers' minicamps with a wrist injury.
"We're in need of some depth in the secondary, and we do have a
couple of extras where Engelberger was playing," Nolan said.