ADELAIDE, AUSTRALIA - JULY 07: Robbie Gray of Port Adelaide attempts to mark during the round 16 AFL match between the Port Adelaide Power and the St Kilda Saints at Adelaide Oval on July 7, 2018 in Adelaide, Australia. (Photo by Mark Brake/Getty Images)

Both Port Adelaide and Gold Coast have been forced to activate their medical subs in the opening half of Saturday's clash.

The Power were forced to bring Hamish Hartlett into the game as star veteran Robbie Gray had his day ended early with a left medial injury.

Gray suffered the injury in the second quarter and headed down into the rooms before being ruled out for the remainder of the match.

The news sours what was an exciting evening for Gray, who was celebrating his 250th game in the teal and black.

Suns midfielder David Swallow was also subbed out of the clash after suffering concussion.

Swallow sustained the injury in the opening term of the match before the club confirmed his replacement in the early stages of the second quarter after ongoing assessment on the injury.

Suns onballer Brayden Fiorini was subbed into the match for his first game of the season.

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