Kyrie Irving (quad contusion) out for Monday's game vs. Bulls

The injury list is quickly getting crowded again for the Celtics. The team announced on Monday afternoon that All-Star point guard Kyrie Irving will miss his second game of the season in Chicago on Monday night after suffering a quad contusion during Sunday's win against the Detroit Pistons.

Marcus Morris (sore knee) will also sit out his second straight game of the team's three-game road trip. Al Horford is listed as questionable with a knee contusion after banging knees with Pistons forward Anthony Tolliver in the first quarter of Sunday's win.

BSJ Analysis: The Celtics are in their busiest stretch of the regular season (five games in seven nights) so it's no surprise they are showing some extra caution on the second-half of a back-to-back with their leading scorer. However, without Irving, Morris and Gordon Hayward in the fold, the Celtics will be down to 11 active players on Monday night, potentially 10 if Horford isn't cleared to play.

Boston has already called up both two-way players in Kadeem Allen and Jabari Bird for the contest. Allen was active for the team in Sunday last night and I would expect both to be on the active roster tonight. Without Irving starting, Marcus Smart will slide into the starting five at point guard. If Horford can't go, I'd expect Semi Ojeleye to get the nod as a small-ball power forward for Horford, which would open the door for some Guerschon Yabusele and/or Abdel Nader minutes off the bench. Shane Larkin should log some heavy minutes at backup point guard against the Bulls as well.