Rovers boss Brian Flynn will go into the final game of the season with almost a full squad to choose from.
Midfielder Syers made his comeback from an ankle injury as a second-half substitute during the 1-0 home defeat to Notts County while right-back Quinn (leg) was an unused sub.
Midfielders Woods (calf) and Keegan (thigh) have trained this week and also come back into the reckoning.
Goalkeeper Gary Woods (back) also returned to the squad last weekend and he could replace veteran Neil Sullivan.
Andy Griffin is the only player unlikely to feature again this season, should Doncaster be forced to settle for the play-offs.
That will only happen if they are beaten by Brentford. If Rovers avoid defeat they will seal automatic promotion and an immediate return to the Championship. Victory would see Flynn's side clinch the title if leaders Bournemouth fail to win at Tranmere.
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