Lacazette hit a double because the Gunners clinched a 2-Zero victory towards the Baggies to get their season again on the right track.
The club-record summer time signing got here off within the 83rd minute and he was once changed by way of Olivier Giroud.
And explaining his determination to convey him off, Wenger mentioned: “I took him off as a result of he was once drained.
“He had a possibility to attain a hat-trick however I gave him the penalty as smartly.
“So general, what you wish to have is to win the sport and to not take any gambles as a result of if they arrive again to 2-1 it may be nervy finally.
“So when the man is a little bit drained and when you’ve got Giroud at the bench, you understand you will have to protect on set items or Giroud can ranking the 3rd purpose.”
Wenger additionally hinted Lacazette is more likely to proceed to be the designated penalty taker after the Frenchman transformed his spot kick.
He added: “Yes, till now I gave them to him.
“I noticed him just a little bit as a result of we paintings smartly on consequences in coaching and I believe he took his penalty smartly this night.”
Wenger, in the meantime, insists he gained’t play a weakened aspect towards BATE Borisov within the Europa League on Thursday (6pm).
He added: “When you have a look at the agenda over the weekend I believe there was once some room for us to be scheduled in a different way, however we need to settle for it and we wish to pass to Borisov with a excellent workforce.
“I will be able to pass with a workforce of senior avid gamers and without a doubt with a tender bench.”