Imps boss Sutton said: "He's genuinely in a really bad way. He hasn't even been able to get out of bed since.
"I doubt he'll play again this season unless something dramatic happens. We will really miss him."
Sutton is already without Nathan Baker (ankle) for around another month and Adam Watts (broken leg) for the rest of the season, leaving him desperately short of defensive options.
Source: Team Talk
Source: Team Talk