The South Korean star played a huge role in getting us into the fourth round with a cracker to open the scoring in our third round replay win at Leicester.
Now the U’s - currently bottom of League One - await in round four at the Weston Homes Community Stadium.
“I know from playing in Germany that cup matches like this are never easy,” said Sonny. “Colchester have full motivation, they will hope they have a chance to win and they will give 100 per cent. I think we have more quality than this team so we will need to have full concentration and give 100 per cent to go into the next round.”