Now — after the Giants starting running back David Wilson played so badly Sunday night he was benched — the Giants will work out free-agent running backs Jacobs and Willis McGahee on Tuesday, a league source told ESPN NFL Insider Adam Schefter.
The Giants had planned to work out McGahee since Friday, according to the source.
Former New York Jets running back Joe McKnight also will work out for the Giants on Tuesday, sources confirmed to ESPN.
The bruising Jacobs, 31, spent his first seven seasons with the Giants before struggling through an injury-plagued season with the San Francisco 49ers in 2012. San Francisco waived Jacobs in December after the outspoken veteran was suspended for the final three regular-season games reportedly because he used social media to complain about a lack of playing time.
McGahee, who will turn 32 next month, was released by the Denver Broncos in June following a productive 2012 season that was cut short by a significant knee injury. Despite not participating in Denver's voluntary offseason workouts, McGahee insisted that he had no physical restrictions when he was released.
Jacobs rushed for 56 touchdowns in his seven seasons with the Giants and was a key contributor on New York's two Super Bowl-winning teams under coach Tom Coughlin.