PORT Adelaide has provided a report to the AFL explaining its decision to allow Hamish Hartlett back on the field after a head knock against Hawthorn.

The 25-year-old left the ground midway through the second quarter after his head hit the ground when Hawks' forward Jack Gunston knocked him over in a marking contest.

He was assessed immediately by Port Adelaide's medical staff on the bench and cleared to play, returning to the field about four minutes after the incident.

Hartlett was able to conduct a television interview at half-time and finished the game without incident. 

He trained with Port Adelaide on Monday and is expected to be available to play North Melbourne on Saturday afternoon.

Hartlett told News Corp after the game he felt fine to play the remainder of the game.

"Obviously I copped a pretty heavy knock, but I went through all the concussion protocol down on the bench," he said. 

"I did all the testing, no worries."

With concussion a hot topic, it is increasingly common for the League to follow up with club officials when players return to the ground after injury to ensure correct process is being followed.

The 2015 injury survey released on Friday showed that the number of games missed through concussion had skyrocketed as doctors, coaches and players adopted more conservative treatment methods.

A response from the AFL to Port Adelaide's report is not expected until later this week.