Blues boss Frank Lampard and everyone concerned with the club will be hoping their leading goalscorer has avoided serious injury after a heavy fall in the game, but it is too early to reveal the full extent of the damage.
England striker Abraham was carried from the field by stretcher at half-time, having landed awkwardly on his hip.
Lampard revealed Abraham was in the Blues' dressing room at the Mestalla Stadium at full-time, but was unable to give a clear diagnosis.
"He's in the dressing room now,"; said Lampard, of Abraham. "The word at half-time was that it looked quite severe, but the word afterwards was that it wasn't quite so severe. But that's all I know at this point now."
Meanwhile, Lampard believes Chelsea's last-16 destiny remains in their own hands despite missing the chance to qualify with a game to spare in Spain, as Daniel Wass' fluke goal grabbed Valencia a late draw.
Christian Pulisic's nudged finish handed Chelsea a 2-1 second-half lead, after Mateo Kovacic's first Blues goal cancelled out Carlos Soler's opener.
Jorginho was lucky to escape a second booking and a red card for the foul on Jose Gaya that gifted Valencia a second-half penalty, that Kepa Arrizabalaga then saved in style.
Maxi Gomez missed a hat-trick of first-half chances as Chelsea rode their lucky, only for Denmark midfielder Wass to miss-hit a cross that lofted straight over Kepa and into the net.
Lampard insisted Chelsea were not fortunate to avoid defeat, despite the hosts creating and spurning a string of gilt-edged chances.
"I'm happy to a degree, you come here to win but you respect the opponent, the Champions League and how tough it is," he said.
"It was a really tough match for us but it does keep it (qualification for the last 16) in our hands."
Chelsea face Lille at Stamford Bridge on Tuesday, December 10 in their final Group H encounter, where Lampard believes the Blues can seal their passage to the knockout stages.