Arsenal have been asked by the Football Association to provide their observations following the claim that Cesc Fabregas spat at Hull assistant manager Brian Horton.
The FA have examined Hull's evidence and now want to hear from Arsenal and Fabregas, giving them a week to respond.
The FA have confirmed they will consider their next course of action after all evidence is gathered and assessed.
Gunners captain Fabregas, who did not play in the match, was accused of spitting at Horton in the tunnel after the match, which Arsenal won 2-1.
The Spaniard "categorically" denied the offence following the claims from Hull.
Hull manager Phil Brown said on the night of the match: "I was there and I witnessed it, he spat at my assistant manager down the tunnel.
"That is their club captain, hopefully he is proud of himself. He spat at his feet."