The 10th-placed Potters have now reached 40 points for the season and are 14 points clear of the bottom three with six games to play.
However, looking to better their previous best finish of 11th and points tally of 47, Ireland insists there is no chance of performances dropping off.
He said: "We have to keep chasing ninth that's all we can do and it's what we want to do.
"We don't want to settle for 10th, because we don't want to get complacent. We want to keep going and going.
"You never know. There could be something riding on the last game of the season for us at West Brom - and that's what we want.
"We don't want to go there and just have a friendly game. We want to go and hopefully be in a position to secure ninth."