JOBE Watson headlines a long list of casualties from theweekend's matches, with the Essendon skipper to undergo surgery on Monday torepair a broken collarbone. 

Watson sustainedthe injury when he received a fair bump from Port Adelaide big man Justin Westhoffduring the first quarter of the Bombers' 30-point win at Etihad Stadium onSunday night. 

The 28-year-old'schances of winning a second consecutive Brownlow Medal could be dashed as hefaces four to six weeks on the sidelines. 

Essendon'smidfield could look vastly different against the Western Bulldogs on Sunday,with fellow midfield star Brent Stantonin doubt with a leg injury. 

Carlton willsweat on the fitness of key forward JarradWaite, who hurt his left knee – the one he had reconstructed in 2009 –early in the loss to Collingwood on Friday night. 

The Blues say theinjury-prone star suffered bone bruising and club medicos will monitor himbefore deciding on his availability for the must-win game against St Kilda onSaturday. 

Two other Bluesstars also under injury clouds are EddieBetts, who suffered a corked hip and didn’t make an appearance in thesecond half against the Pies, while MitchRobinson copped a knock on his already sore shoulder. 

Mystery continuesto surround Harry O'Brien's availabilityfor Collingwood's big clash with finals aspirant Adelaide at the MCG on Fridaynight. The Magpies insist O'Brien missed the Carlton blockbuster with an ankleproblem, despite reports that he has fallen out with coach Nathan Buckley. 

The Crows,already short on key forwards, appear certain to be without young big man Shaun McKernan, who faces a lengthyspell on the sidelines after being reported for a crude bump on West CoastEagle Brad Sheppard.

Fellow Crows Aidan Riley (ankle) andBernie Vince (concussion) could alsomiss the encounter with the Pies. 

Fremantledefender Luke McPharlin, who hasbeen in All Australian form this season, could be sidelined a massive derbyclash with West Coast on Sunday after hurting a calf. 

Geelong veteran Joel Corey's availability forSaturday's game against Melbourne at Simonds Stadium will be monitored after hewas accidentally concussed while tackling Hawthorn veteran Sam Mitchell

Mitchell couldcome under attention for making high contact with Cats tagger Taylor Hunt. 

Richmond'sreality-check defeat to North Melbourne was compounded by an ankle injury to Daniel Jackson, the late withdrawal of Bachar Houli with a hamstring issue,and the accidental concussion of promising youngster Brandon Ellis

The trio is indoubt for the Tigers' clash with Gold Coast at Cazaly's Stadium, where they arewinless from two encounters with the Suns. 

Sydney forward Sam Reid faces more time on thesidelines after suffering a torn left quad in his return match against Melbourne.Demon defender James Frawley experiencedhamstring tightness. 

Greater WesternSydney spearhead Jeremy Cameron, anoutsider for the Coleman Medal, will come under scrutiny for a high-speed hitthat left Western Bulldog speedster JasonJohannisen dazed and with a season-ending shoulder injury. 

Giants teammate Taylor Adams also appears to be introuble after an off-the-ball incident in which he struck Dogs champion Adam Cooney to the back of theneck/head with a right hand. 

Bulldogsmidfielder Tom Liberatore received acut to his head. 

Brisbane Lionscaptain Jonathan Brown will be scrutinisedfor a clumsy high tackle on Gold Coast youngster David Swallow during theQClash on Saturday night. Brown was suspended for two games after making high contactwith Carlton backman Michael Jamison in round nine. 

Lions midfielder Brent Moloney has a left calf problem whilethe Suns' Sam Day experienced grointroubles. 

Ben Collins is a reporter for AFL Media. Follow him onTwitter: @AFL_BenCollins