Hibs lost to St Mirren on Saturday to leave the club just three points above the play-off spot.
Afterwards both Ben Williams and Kevin Thomson castigated their team-mates for another bad performance. Riley, though, hopes that his side will now come together to avoid the play-off.
"Right now is not the time to cause rifts," said Riley ahead of Sunday's derby with Hearts. "If [Thomson] has ruffled a few feathers it's only because he wants Hibs to avoid relegation."