The South Korean international - in flying form at the start of his Spurs career - unfortunately picked up a foot injury against Manchester City on Sunday - as we reported here earlier today.
Sonny will continue to be assessed by our medical staff.
Otherwise, Mauricio remains without Ryan Mason (knee), Mousa Dembele (foot), Nabil Bentaleb and Alex Pritchard (both ankle).
We kick-off at Stade Louis II at 7pm local time tomorrow, 6pm UK.
MONACO v SPURS - MATCH CENTRE