Reyes out of hospital with neck strain
Reyes had a scan and spent the night under observation after tumbling awkwardly during Sunday's 2-1 league defeat at home to Villarreal.
He was carried off the pitch wearing a neck brace.
The 26-year-old set up Simao Sabrosa for Atletico's goal, and has been one of the few positives for the team this season. They are struggling one point above the relegation places in 14th.