The French midfielder produced a studs-up tackle on the Senegal international in the first half at St Mary's but for some reason, referee Andre Marriner did not even reward a free-kick.
Hammers boss Sam Allardyce was none too pleased with the lack of protection Diame received but Schneiderlin feels he did not orchestrate a sinister attack on his opponent.
"I need to see the image again but at that moment I didn't think I had done anything wrong," he told Sky Sports 1.
"I didn't have the feeling at the time that it was bad, I am not a player who commits those kind of fouls.
"If I touched him in any way I apologise but I have not the feeling that I did anything wrong."