Arsenal captain Cesc Fabregas has been charged with improper conduct by the Football Association following allegations he spat at Hull assistant boss Brian Horton after the FA Cup tie at the Emirates Stadium on March 17.
The Gunners were asked by the Football Association to provide their observations, and according to manager Arsene Wenger, they have now decided to take the matter further.
"Fabregas has been charged for improper conduct on the night," the Arsenal manager said, speaking at Friday's press conference ahead of the Barclays Premier League game against Middlesbrough on Sunday.
"I always said we are always very open to co-operate with any investigation," he added.
"I personally looked at the reports, at the video evidence and there is nothing in there against Cesc."
Fabregas, who was not playing against Hull because of a knee injury, issued a statement on the evening of the incident to deny he spat at Horton in the tunnel.
Should the charges be proven, Fabregas - who missed more than three months of the campaign with a knee problem which required surgery - could face a suspension.
However, that would only be for domestic matches and as such would not cover the forthcoming Champions League semi-final against Manchester United.
Wenger continued: "I dont know if we will appeal - I will see what we can do about that. At the start, I am not a great fan of appealing because I said we are very open to co-operate and now I dont think we should stop that.
"I am very positive that there was enough evidence in what I have seen that the case should have been dropped."
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