MELBOURNE has been dealt a double blow with significant injuries to ruckman John Meesen and small forward Austin Wonaeamirri confirmed on Wednesday night.

Meesen's season is over after a stress fracture was discovered in his right foot while Wonaeamirri, who was grounded by a hamstring tear in the pre-season, damaged knee cartilage when playing for VFL affiliate Casey on Saturday afternoon and could miss up to six weeks.

Twenty-two-year-old Meesen had played the last four games for the Demons but pulled up sore from Sunday's loss to Geelong at the MCG.

Traded from Adelaide at the end of 2007, Meesen struggled to have an impact in his first year at Melbourne and spent it in the VFL.

A first-round draft pick in 2004, he played just two games with the Crows but was finally enjoying some progression until this setback.

"John has performed well at the senior level this year and this news is obviously very disappointing for both he and the club," general manager of football operations Chris Connolly said in a statement released by Melbourne.

"The focus will now turn to preparing John for the commencement of the 2010 pre-season."

Meesen will have surgery on his right talus bone in the coming weeks, though Wonaeamirri will be operated on within days.

Wonaeamirri was one of the Demons' shining lights in a disappointing 2008, earning an NAB AFL Rising Star nomination and finishing second in their goalkicking with 24 from his 18 games.

The 20-year-old tore his hamstring in Melbourne's NAB Cup loss to Hawthorn in February and re-injured the muscle at training in March, but was again nearing senior selection.

However, scans revealed a tear in the lateral meniscus in his knee, which he twisted in Saturday's game.

"This is an unfortunate injury for Austin, but we look forward to having him available for selection in the second half of the year," Connolly said.

Melbourne already has emerging defender Colin Garland (foot) out for an indefinite period while ruckman Mark Jamar (foot) is also on its long-term injury list.

Draftee Sam Blease fractured his fibula last week but experienced utility Brad Green hopes to return from a broken jaw in a fortnight.