Uwe Rosler's side are the current holders and sprang a major surprise by beating high-flying Manchester City at the Etihad in the previous round.
"As a player, the pressure is the same for every game, especially when you're at a club like Arsenal," Ox told Arsenal Player. "It's inevitable that we go into quite a few matches during the season as favourites, so we just have to handle it and believe in our qualities.
"For this match, we have full respect for Wigan and they've got some very good players who are definitely Premier League quality. I watched their match in the quarter-final when they knocked out Manchester City. They defended really well for large parts of the match, but were very dangerous going forward and full credit to them for a fantastic victory."