Winger Murray Taulagi was ruled out of Queensland's side with a calf injury while outside back Selwyn Cobbo will have scans on a suspected wrist fracture.
Middle forward Pat Carrigan went to hospital on Sunday night to visit a specialist for stitches to fix a lip gash and may need the assistance of a plastic surgeon for the injury he sustained in Brisbane's 30-26 loss to St George Illawarra.
Fermor has been a shining light for the Titans this season in a struggling side and is a timely addition after Dolphins forward Tom Gilbert was ruled out with a pec injury.
The Maroons were on Sunday handed last-minute selection hurdles, with Taulagi's injury compounded by the Cobbo blow.
North Queensland winger Taulagi was set to be named on the wing for the May 28 series opener, before he pulled up sore from the Cowboys' loss to Manly.
The 26-year-old is expected to miss at least a couple of weeks, ruling him out of at least Origin I and placing him in doubt for game two.
Cobbo injured his wrist in the second half of the loss to the Dragons while playing fullback.
He had it strapped and was moved to wing.
Coach Michael Maguire said after the match the injury was not considered serious, but medical staff have assessed the injury and suspect a fracture. Cobbo will have scans on Monday morning.
Sydney Roosters rookie Robert Toia rocketed into the frame with Cobbo unavailable. Broncos winger Jesse Arthars has been called into the Maroons squad as anticipated as 19th man.
The Broncos confirmed Carrigan had not suffered any serious structural damage after a head clash with Jack de Belin in the final minute against the Dragons.
Carrigan had blood pouring from a split lip, but the location of the cut meant it could not be stapled up.
The Maroons had already lost Gilbert to a pectoral injury, after he went down early in the Dolphins' loss to the Warriors on Saturday.
One man who won't replace him is in-form Warriors edge Kurt Capewell, who was on the plane back to Auckland on Sunday.
Meanwhile, one outside back known to be in the Maroons' squad is Valentine Holmes.
Holmes's presence is desperately needed as a goalkicker, with fullback Kalyn Ponga Queensland's other option.
"He has always done the job and is in pretty decent form for the Dragons," former Queensland centre Brent Tate told AAP.
"It looks like he has found his mojo again.
"Val is just arrow-straight with his kicks, and the process he runs through is so consistent. There is none better in the game as pure strikers of the ball."
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