The England left-back made a rare start in place of Nacho Monreal.
Grosicki joined Hull in the January transfer window from Rennes.
Arsenal fans furious with their team to face Hull
Sat, February 11, 2017
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Arsenal fans are not impressed with their side to face Hull
And Wenger revealed he made the decision for tactical reasons.
He said: "Gibbs comes in for Monreal.
Arsenal's Kieran Gibbs
"I think he [Gibbs] is suited to play against Grosicki.
"He's in good shape. Good form in training as well and there's a battle between the two."