Carlo appeared to injure himself when he fell awkwardly on his knee or ankle behind the Bruins’ net.
The 20-year-old is in his first NHL season, having played 52 games and scoring 12 points. Carlo has been the subject of trade rumours of late with the Bruins on the playoff bubble. Elliotte Friedman reported that the Bruins have twice shot down offers for the defender.
Boston is currently third in the Atlantic Division, one point ahead of the Toronto Maple Leafs.
Thursday’s game started poorly for Carlo before the injury as he one-timed a pass into his own net.
The Bruins recovered to beat the Pittsburgh Penguins 4-3.