St Kilda midfielder Luke Ball is a victim of his own courage, and will miss up to three AFL games because of a strained hamstring.

Ball injured his left leg when he threw himself at a marking contest late in Sunday's game against Port Adelaide at Telstra Dome, and collided with teammate Justin Koschitzke.

The force of the collision took Ball's legs out from under him and he needed assistance leaving the field.

St Kilda initially said Ball had suffered a corked thigh despite speculation he had torn the hamstring away from the bone.

Scans revealed he had strained his hamstring.

"Immediately after yesterday's game the club wasn't able to confirm the extent of Luke's injury due to the unusual nature of its occurrence," the Saints said in a statement.

"Scans this morning revealed that Luke has strained his left hamstring. The strain is to the belly of the muscle, not the tendon."

St Kilda said Ball would be sidelined for between two and three weeks, which rules him out of Saturday night's vital game against Collingwood, where the loser could drop out of the top eight.

He could also miss games against Fremantle and Adelaide.

Although his actions were ultimately costly, Ball's courage helped push the ball the Saints' way for his teammate Jason Gram to kick the sealing goal.

Meanwhile, fullback Max Hudghton will face a fitness test this week, after he missed the win over Port with a calf strain.

Flanker Xavier Clarke (hamstring), who played for Casey Scorpions in the VFL on the weekend, also faces a fitness test.

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