Portsmouth
Pompey are the only top-flight club left standing in a competition filled with shocks this season.
However, the France international has warned his team-mates not to take their eye off the ball whoever they draw in the semi-finals.
The south coast club could face one of three Championship sides - Barnsley, Cardiff City or West Brom - in a last-four encounter at Wembley.
"I don't want to talk about it being one of my most memorable wins," he said, referring to Saturday's 1-0 victory at Old Trafford.
"Let's speak about this if we've won the competition. I don't want to go to Wembley and lose.
"I'm very happy and proud and it's good to beat United, but we have to stay focused and make sure we win the competition now.
"Of course we can win the FA Cup. If we can beat Manchester United, we can win the competition.
"It would be a waste of this famous victory if we didn't go and reach the final and lift the trophy. We must finish the job."