Eichel missed Thursday's game against Florida and didn't face the Bruins in Boston on Saturday. Buffalo lost, 2-1.
Eichel didn't practice Wednesday, and coach Phil Housley said Thursday that Eichel is considered day-to-day.
The Sabres host New Jersey on Tuesday.
"We want to be cautious," Housley said. "There's a lot of hockey to be played."
Eichel played fewer than three minutes Monday against the Islanders due to the injury.
Eichel was named to the All-Star team on Wednesday.