Third-string running back Chris Jennings saw extended action for the first time this season in Monday night's game against visiting Baltimore.
The undrafted rookie from Arizona ran the ball seven times for 18 yards and caught one pass for 10 yards.
"I've liked what Chris has done in practice," Mangini said. "I wanted to be able to get him active, to give him a chance to see what he can do, give him some chances for carries."
Jennings spent the first three weeks on the practice squad before being signed and playing against Cincinnati, when he rushed once for 8 yards and caught one pass for 2 yards. But the next four weeks he landed on the inactive list.
previous four weeks
"I thought he did well," Mangini said of Jennings. "I thought he had a couple runs that were good... One one there really wasn't a lot of space for him to work."
Mangini disputed the idea that there was any connection with Jennings getting more time and 10-year veteran Jamal Lewis announcing he is retiring after the season.
"It's more here's a guy who's shown day in and day out that he deserves an opportunity," Mangini said. "(Jennings) has improved on special teams, now let's give him a chance."