Willock, who was on the losing side, came off the bench in the 73rd minute and scored ten minutes later.
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Willock was seen post-game chatting with Saka and his other old teammates.
He was given Saka's match-worn shirt as a gift to mark the occasion.
Post-game, he said: "I'm grateful for my reception that I got from the Arsenal fans. They gave me a good reception. Arsenal gave me a lot during my career.
"I was there since I was four and a half, so they gave me a lot, and I'm thankful for them, but today playing for Newcastle United and losing was a bit disappointing."