The Boston Celtics won't have their top big man back Friday night. Al Horford, who has been in the NBA's concussion protocol for a hit suffered on Oct. 6
, will be held out of tonight's game vs. the Charlotte Hornets (7:30 ET, NBA League Pass
Horford sat out the Celtics' last game, a 107-96 home victory against the Los Angeles Lakers, as he was being monitored as a part of the concussion protocol. Boston has won 10 straight games since starting the season 0-2.