Extra tickets are available to Glentoran fans ahead of Saturday's Big Two derby at Windsor Park (3pm).
There has been massive demand for the eagerly anticipated clash at The National Football Stadium.
The Glens were initially allocated just over 2,000 tickets which have been flying out.
A number of extra tickets will also be made available at Windsor Park prior to kick-off, as Linfield traditionally do for every home game.
Glentoran confirmed that the tickets will be sold on a first come, first served basis. They are expected to go on sale at 1.30pm.
"With at least three of our official outlets now sold out and demand for tickets very high, Linfield have informed us that there will be tickets available on the concourse leading to the North Stand at Windsor Park tomorrow (Saturday), prior to kick off," the club said on its website.
"Glentoran supporters are urged to get to the stadium early to avoid disappointment.
"Additionally, as we have already announced earlier this evening, the remaining tickets from our original allocation (including concession) will be available from The Glentoran Superstore TOMORROW (Saturday) MORNING from 10AM - 12:15PM.
"Let's see a bumper Glentoran support at the National Stadium tomorrow. The players have appreciated how we have been behind them this season.
"We can be that fabled extra man for them against our old rivals."
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