Former Melbourne ruckman Mark Jamar has joined Essendon as the club's seventh top-up player.

Jamar, who nwas working as a part-time ruck at the club was convinced to come out of retirement for 2016.

"We obviously needed to add a ready-made ruckman to our list. Mark, as a big-bodied, All Australian ruckman will provide us with a great deal of experience,” General Manager of Football Rob Kerr said.

"We feel Mark will work well with Matthew Leuenberger and assist with the development of our young players such as Gach Nyuon."

Jamar played 155 games with Melbourne in 14 seasons at the club.

Port Adelaide was also understood to be interested in signing Jamar as a top-up player, if their request to do so was granted by the AFL, with ruckman Paddy Ryder suspended due to the Essendon supplements program.

Jamar is the Bombers' seventh top-up signing, joining Ryan Crowley, James Kelly, Matthew Stokes, Matthew Dea, Jonathan Simpkin and James Polkinghorne.

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