The Brazilian international injured his knee in a clash with Spurs striker Harry Kane, and manager Graham Potter says the seriousness of the issue has yet to be determined.
Mateo Kovacic was surprisingly absent from the matchday squad on Sunday, but it was later revealed that the Croatian international was suffering from an illness.
N’Golo Kante is back in full training but Potter has emphasised that there is still some way to go before the France international is ready to play first team games.
Captain Cesar Azpilicueta was ruled out of the Tottenham fixture due to concussion protocols but he could return for the Leeds match this weekend.
Christian Pulisic is nearing a return to full fitness following a knee injury that he sustained against Manchester City at the start of January, but Edouard Mendy (broken finger) and Armando Broja (ACL) remain long-term absentees.