
The 30-year-old started alongside Harry Kane and Lucas Moura at the Orange Velodrome but was involved in a nasty clash with goalscorer Chancel Mbemba in the first half.
Son was able to walk off the field, albeit with some difficulty, as Spurs came back from 1-0 down to advance to the last 16 as Group D winners with a dramatic late 2-1 win.
After Son was withdrawn, Clement Lenglet headed home for Tottenham after Mbemba's opener before Pierre-Emile Hojbjerg lashed home in the fourth minute of second-half injury time.
The South Korea international joined in with the dressing room celebrations after the game, and assistant coach Cristian Stellini provided a positive update on his condition.
"We have to check Sonny tomorrow. We wait for the medical assessment... we have to check tomorrow," Stellini told Tottenham's media channels before adding a further update in his press conference.
"Sonny feels better now. I saw him in the dressing room. He celebrated with us. So, we will wait for tomorrow. It is his face. His eye is a bit swollen," Stellini added.