All 18 clubs are preparing for a weekend in South Australia as the competition descends onto Gather Round.Collingwood will be without an important duo, while soft-tissue issues have whacked Carlton and Geelong.Here's the latest on the injury front across the AFL landscape...ADVERTISEMENTFremantle star ruled out of Tigers clashFremantle will sideline star ruckman Luke Jackson in Gather Round after the 23-year-old suffered a hamstring injury in Round 4.Longmuir confirmed the news on Fox Footy's AFL 360 on Monday, while post-game believing that the strain was low-grade.Pie pain as pair to miss Gather RoundCollingwood will be without Jordan De Goey (achilles) and Lachlan Schultz (hamstring) when they take on Sydney in Adelaide on Friday.ADVERTISEMENTDe Goey is reported to have an inflamed achilles, and after being subbed out of Thursday's win against Carlton.It is understood that he may miss only one match but will be assessed ahead of the Round 6 clash against Brisbane.As for Schultz, who dominated the Blues last week, he injured his hamstring at training on Sunday.The ex-Docker is expected to miss up to three weeks in a crucial blow to the Pies.He'll miss clashes against the Swans and Brisbane at the very least, while Anzac Day against Essendon looms as a potential return.It comes as the club accepted Dan Houston's two-match ban for his bump on Lachie Fogarty.Dees-aster as leader forced into surgeryMelbourne premiership defender Jake Lever could miss the next eight weeks of football following a troublesome ankle.Lever's issues have been persistent throughout the last 12 months, but after meeting his surgeon on Monday, he has opted to undergo surgery to help rectify the problem."We've been looking to manage Jake conservatively, and he's done a power of work to try to get up for each game, but due to a lack of function and continued pain, he hasn't been able to do that," Demons High Performance Manager Selwyn Griffith said."As part of our management process, we sought some expert opinions. He saw a surgeon today and, unfortunately for Jake, he will now undergo surgical intervention and he'll likely be out for approximately eight weeks."Ruckman Tom Campbell has been sidelined with a minor hamstring injury, while young forward Matt Jefferson remains a test as he looks to return from a hand fracture.Similar to Xavier Lindsay, who will be pushing his case after being sidelined with a low-grade injury to his medial ligament following Round 3.Geelong blow as premiership defender downedCats defender Jack Henry will miss three to four weeks of football following a hamstring injury in the victory over Melbourne.Henry was subbed out during the second quarter of Friday's win."Following scans on Monday, Jack is expected to miss the next three to four weeks with a hamstring strain," Geelong EGM Andrew Mackie said."Whilst disappointing for Jack, he has started the year off extremely well,l and we are looking forward to seeing him back playing."Henry will miss games against Adelaide and Hawthorn, but could be in the frame to return against Carlton in Round 7.Cowan cursed by hamstring injuryLachlan Cowan could miss up to six weeks after Carlton confirmed the hamstring blow in the disappointing loss to Collingwood in Round 4.Cowan was subbed out of the contest in the early stages of the game due to the hamstring injury, with scans since showing a strain that will sideline the Tasmanian for at least a month."Carlton defender Lachie Cowan is expected to miss the next four to six weeks with a hamstring injury," a club update read."Cowan was subbed out in the first quarter of Thursday night's game, with scans confirming a strain to his left hamstring."He will commence his rehabilitation with the Club to assess his progress in a month."Cowan misses contests against West Coast, North Melbourne, Geelong, Adelaide, and potentially St Kilda and Sydney in Round 10.
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