We have enough players to try and replace him.
"We have to be positive".
Son made it six goals in four FA Cup games this season against third tier Millwall and he even set up fellow forward Vincent Janssen to end a seven-month wait for a goal from open play since joining Tottenham.
England worldwide Kane, the Premier League's joint top-scorer, had to hobble off after falling awkwardly and suffering an ankle injury in a sixth-minute challenge with defender Jake Cooper during their sixth round tie.
Striker Harry Kane went off injured during the early part of the cup clash against Millwall and Janssen could be the player to replace the England worldwide in the starting line-up if he is out of action for some while.
The icing on the cake was a first goal from open play in the 79th minute for Spurs' under-achieving striker Janssen.
It could be a huge loss for Spurs, whose alternative options Son Heung-Min and Vincent Janssen have not been almost as prolific as Kane.
Pochettino added that "in a key period for every team maybe we miss our main striker and players like Janssen and Sonny- maybe they don't play in the last few weeks in the starting XI- will be important for us".
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But Harris said: "What I will say is me personally - and the club - we won't condone that".
Making a perfectly-timed run onto Kieran Trippier's pass, Son got in behind the Millwall defence in the 54th minute and volleyed a fine finish past King. It's sure it will be hard for him to play against Southampton on Sunday but we need to wait now and see what happens.
"I didn't hear anything", said Millwall manager Neil Harris.
"We want people dealt with harshly of course".
Herman Ouseley, the Millwall-supporting chairman of anti-racism group Kick It Out, was unaware of the offensive interpretation of the "DVD"-related chants".
"It has been a different story at Wembley, where Tottenham have held their home games in the Uefa Champions League and Europa League due to the construction of a new 61,000-capacity arena on the same site as White Hart Lane".
Son scored a hat-trick as Tottenham joined north London rival Arsenal and Manchester City.