Toronto FC will be without veteran defender Drew Moor for Saturday's match against Columbus Crew SC.

The MLS team says a medical exam following training this week showed a cardiac arrhythmia — or irregular heartbeat.

The team said in a statement that further testing is needed "to determine diagnosis and management."

Moor will not travel with the to Columbus "as a precaution."

The 33-year-old Texan has anchored the Toronto defence since joining the club prior to the 2016 season as a free agent from Colorado.