Manchester United vs Arsenal - Premier League match preview
The pair came together in 2003 during when Arsenal and Manchester United saw out a heated 0-0 draw at Old Trafford.
Van Nistelrooy missed a penalty in stoppage time, with the Gunners going on to claim the Premier League title that season undefeated.
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Ray Parlour regrets clashing with Ruud van Nistelrooy
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Ruud van Nistelrooy was mocked after his penalty miss
After he hit the bar from the spot, the Dutchman was pushed around and mocked by Parlour, Martin Keown, Lauren and Ashley Cole.
And Parlour says he regrets his actions, which led to fines for the former Arsenal stars.
"It was always a very passionate game against United," Parlour told Sky Sports. "It was our biggest game of the season but we were out of order.
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"We overreacted and I regret it now. It was just one of those situations that got a bit heated.
"We all got fined from the FA. Martin Keown got fined £20,000, I got £10,000, Lauren and Ashley Cole were fined £5,000."
Arsenal go up against United at Old Trafford on Saturday (12.30), with the Gunners already six points ahead of their rivals in the Premier League table.