Dangerfield went straight into the rooms after stuttering while attempting a kick up forward.
His injury concerns comes as selectors weigh-up when Gary Ablett should return to the Cats side.
Ablett missed the game in Colac due to a minor hamstring strain.
In another injury blow for Geelong, ruckman Rhys Stanley left the ground early with a suspected calf injury.
Essendon also have injury concerns after defender Martin Gleeson was carried off in the final quarter with a knee issue.
Aided by a strong breeze, the Bombers kicked four straight goals to open the final term and snatched a match-winning lead through Jake Long in the dying minutes.
Star recruit Jake Stringer impressed for the Bombers with two audacious goals - the first an audacious banana from deep in the pocket, the other an off-balance snap on the run.
Young guns Zach Merrett and Andrew McGrath were typically industrious in the midfield but spearhead Joe Daniher was well held by Geelong veteran Harry Taylor.
Tom Hawkins slotted five goals and was the catalyst for Geelong in a dominant third quarter after trailing by three points at halftime.
Forward partner Daniel Menzel also slotted four majors while skipper Joel Selwood started slowly but finished with 35 disposals, 12 clearances and five inside-50s.
A crowd of 9,115 attended the Central Reserve match.
Visitors to the venue have praised the work done to bring the ground up to AFL standard.
Following the AFL match, it was another victory for the Bombers in the VFL 14.10 (94) to Geelong 6.9 (45).