The incident occurred during the opening half of Thursday’s 34-6 NRL loss to Parramatta.
The Broncos’ veteran missed the entire second half of the defeat as the NRL season resumed following a 10-week hiatus due to the COVID-19 crisis.
The match at Suncorp Stadium was Glenn’s first since being appointed Broncos captain after missing the opening two matches with a hamstring injury.
In his absence the Broncos conceded 22 points to nil as the Eels romped to a comfortable win.
Whether Glenn’s cut just needs a clean out and stitches or more complex treatment won’t be known until he goes under the knife but he will be in doubt for Thursday’s clash with Sydney Roosters in Brisbane.
With David Fifita (knee) already sidelined and Tevita Pangai Jnr suspended until round six, Glenn’s absence would leave the Broncos short on backrow options against the reigning premiers.
Broncos coach Anthony Seibold admitted he has some selection issues to consider.
“We’ll probably have our three key edge backrowers gone … we’ll have to see what we do there,” Seibold said.
Prop Payne Haas played a bit of a lone hand against the Eels, racking up 164 running metres and making 38 tackles in another impressive display by the 20-year-old.
Having got through his first game since an ACL injury in pre-season, Matt Lodge will be better for having had a run while.
Fellow returnee Joe Ofahengaue will be hoping for a busier night against the Roosters after making a low-key comeback following suspension for the opening two rounds.
Seibold was hopeful his team would respond better to adversity in the future than they had against the Eels.
“Losing Alex at halftime, had to shuffle a few players around, just probably we didn’t quite handle that,” he said.
“They’re big outs but it’s not the reason why we lost.”