Back on the practice field after a two-week layoff, San Francisco 49ers running back Jerick McKinnon suffered another setback Tuesday in his return from a torn ACL.
General manager John Lynch told KNBR on Wednesday that the news is “not encouraging.”
McKinnon, 27, signed a four-year, $30 million contract with San Francisco in March 2018 but missed all of last season after injuring his right knee in practice before the season opener.
McKinnon had been sidelined for 18 days after receiving a platelet-rich plasma injection to help relieve soreness in the knee.
McKinnon played in 58 games with the Minnesota Vikings from 2014-17, rushing for 1,918 yards and seven touchdowns and catching 142 passes for 984 yards and five scores.
If McKinnon is unavailable, San Francisco’s backfield for the Sept. 8 opener at Tampa Bay will feature last year’s leading rusher Matt Breida and former Atlanta Falcon Tevin Coleman.