Southampton boss Claude Puel refused to be drawn on why captain Jose Fonte was missing from the squad at Carrow Road as Norwich scored an injury-time equaliser to seal an FA Cup third-round replay.
Portugal defender Fonte was left out of the third-round clash completely after it was revealed earlier in the week the 33-year-old has asked to leave St Mary's.
Fellow centre-back Virgil van Dijk returned from suspension and opened the scoring with a volley, only for Steven Whittaker to level from the penalty spot after Saints' 19-year-old debutant goalkeeper Harry Lewis fouled Cameron Jerome.
The Premier League side looked set to be into round four when Maya Yoshida nodded Southampton back in front, but Naismith's last-gasp effort means the sides will have to meet again to see who will make it through.