PORT Adelaide duo Jase Burgoyne and Mitch Georgiades have undergone surgery but are expected to return to training early in the new year, while Jason Horne-Francis is training lightly after surgery in October.
Burgoyne landed awkwardly and injured his knee on Wednesday during Port Adelaide's pre-season camp on the Sunshine Coast.
The defender flew back to Adelaide on Thursday to have his right knee assessed before undergoing an arthroscopy to have the lateral meniscus trimmed.
The 19-year-old is expected to be back running in early January.
Georgiades has also had a minor procedure to remove the syndesmosis buttons in his left ankle, but is expected to be back running within a fortnight.
The forward had a syndesmosis repair at the end of last season and he had the follow-up procedure to alleviate some irritation.
Meanwhile Horne-Francis has returned to the training track after undergoing surgery on both legs to decompress the arteries behind his knees.
The 19-year-old joined the Power from North Melbourne earlier this month in a mega trade during the Continental Tyres AFL Trade Period.
Horne-Francis is expected to be available for round one next year despite having a slightly restricted start to pre-season training.