The Gunners and Spurs have been paired together after their respective fourth-round wins over Blackpool and West Ham.
"I have huge experience and a huge desire to share what I know about the game and what is important in the game with people who need it".
Sky Sports News understands that the Wales global, who played the full 90 minutes at the Emirates Stadium on Wednesday evening, will leave the Gunners for free at the end of the season after being told why he will not be offered a new contract following a breakdown in negotiations.
"We are very good friends from Spain. Added to that it's a derby, so it will be fantastic".
Chelsea host Bournemouth, while Leicester or Southampton will play the victor of Manchester City and Fulham.
League One side Burton Albion and Championship side Middlesbrough are the only two non-Premier League teams remaining in the competition, and they will face off in another quarter-final.
Reigning champions Manchester City play Fulham on Thursday and the victor will face either Leicester or Southampton.
The match, originally scheduled to be played on Tuesday, was postponed following the death of Foxes owner Vichai Srivaddhanaprabha in a helicopter crash.
Both players are nursing hamstring injuries, but will be checked prior to the cup match and may be in line for a return against the midtable League One side.