Martinez, a fifth-year senior with more than 10,000 yards of career total offense, missed Nebraska's Sept. 21 victory over South Dakota State, snapping a streak of 32 starts dating to his freshman season.
In his place, redshirt freshman Tommy Armstrong and senior Ron Kellogg III shared time, leading the Huskers to more than 300 yards rushing and 300 passing for the first time in school history. Armstrong started the game, completing 12 of 15 throws for 169 yards; Kellogg completed 8 of 9 for 136 yards.
Martinez did not practice during Nebraska's off week. He also sat on Sunday as preparations began for the Illini. The Huskers did not practice Monday.
"It's still to be determined," coach Bo Pelini said. "I think he's getting closer to being 100 percent. He's feeling a lot better."
Teammates said they feel confident with the backups but that they've noticed Martinez's eagerness to return.
"It's killing him," senior offensive tackle Jeremiah Sirles said.