Mantha is dealing with an illness and is questionable to face Colorado on Tuesday, Mike Morreale of NHL.com reports.
Mantha has gotten on the scoresheet in just one of the Devils' eight contests while producing a mere 10 shots. Unless the 32-year-old forward finds his game soon, he may not reach the 30-goal and 60-point thresholds as he did last year. If Mantha can't play Tuesday, Jesper Boqvist could see time in a bottom-six role.