Champion West Coast forward Josh Kennedy looks almost certain to miss Thursday’s clash with Essendon in Perth and could be sidelined for up to a month.

Kennedy is the latest injury casualty in another blow to the Eagles’ premiership hopes for this season.

The powerhouse scoring source is nursing bone damage in his right knee and expected to fail any attempt to prove fit enough to take on the Bombers.

The Eagles' Josh Kennedy celebrates a goal during the team's round 13 clash with the Sydney Swans. Kennedy limped off the field during the match, and is in doubt for this Thursday's game against Essendon at home. Credit:AAP/David Moir

It is understood the two-time Coleman medallist could be out for as much as four weeks depending on the severity of damage suffered in a 15-point loss to Sydney at the SCG last Friday.