Ireland was sent off for a lunging tackle on Young-Pyo Lee after 83 minutes and moments later, Jermain Defoe drilled home what turned out to be the winner.
Earlier, Pascal Chimbonda opened the scoring in closing stages of the first half and substitute Rolando Bianchi powered home a header to level after 61 minutes.
"When I saw the tackle from the bench I thought it was harsh but looking at it in the dressing room I don't think we should complain about it and we have to accept it," said Eriksson.
"It was a lively game and these things happen in football, they shouldn't happen, but they do happen.
"I don't like the result, but this is one of the better away games we've played. I thought we were brave, we tried to win the game but we've lost, so that's bad."
Sven Goran Eriksson had no complaints about Stephen Ireland's red card as we edged home to a 2-1 win over his City side on Sunday.