The 26-year-old was instrumental for Glasgow Rangers last season en route to the Europa League final, which they lost to Eintracht Frankfurt.
He has now revealed what manager Ralph Hasenhuttl told him before the game against Leeds United.
“I spoke to the manager the day before the match, and he just said, ‘be ready for me for when I need to come on and impact the game,” Aribo told the Daily Echo.
“Things like that happen. That’s what I do, every time I play, I want to leave my impact on the pitch, and luckily I was able to do that,” he continued.
“The manager said he was going to take me out and give me some time.
"I’m here to do the job so no matter if I’m starting on the bench or starting in the team, I’m ready to make my impact on the team.”
“I was sitting on the bench with a towel over my head because it was so hot. It looked carnage for the boys,” Aribo
“It looked so hard to run, and that’s what they did so well, they wore down the opposition, and when the subs came on, we were able to come fresh and make our impact on the game.
“That’s why the manager brings players on, to see a change in the game, to bring a spark.
"It’s so important to have a good squad and to have those options.”
Aribo will hope to be on target again when Southampton take on Leicester City on Saturday afternoon.