A strained knee sustained in Friday's 23-20 loss to Montreal could sideline the all-star slotback up to four weeks, said Winnipeg coach Doug Berry.
Stegall, who is three touchdowns shy of the mark, will undergo more tests on the knee Monday.
"It's a strained knee, I just don't know how severe or how non-severe," Berry told the Winnipeg Sun.
Stegall, who has pondered retirement in recent years, was injured after taking a low hit from Alouettes cornerback Davis Sanchez.
"It was legal contact," said Berry. "Everybody would rather get hit high and Milt was hit more from the back side and hit low but you can't complain about it because it's football and it's all within the rules."
The Blue Bombers, who are third in the Eastern Division with a 7-8 record, have three games left following a bye this week.
Stegall, who's playing in his 13th CFL season, has been stuck on six touchdowns for three consecutive games.
He is second to Geroy Simon of the B.C. Lions in league receiving with 1,194 yards on 73 receptions.