The South Korea international played 79 minutes of the EFL
Cup semi-final first leg defeat to Chelsea in midweek before making way in an
apparent tactical substitution.
However, ahead of Sunday's FA Cup encounter with Morecambe,
Conte revealed to reporters that Son is carrying a muscular problem and could
be absent until after the next international break.
"It was a strange situation. Against Chelsea I made two
substitutions together, Lucas Moura and Son. Not for injury, their sub, but to
try to give them 15 minutes of rest," Conte told a press conference, as
quoted by football.london.
"The day after Son felt a bit of pain in his muscle, in
his leg and he had a scan. Now we have to make the right evaluations from the
doctors. He's an injury. I don't know but probably they could stay without
training session until the end of this cycle, before the international
break."
Son has banked nine goals and five assists in all
competitions for Tottenham this season and was recently voted the Best
Footballer in Asia for a seventh time.