Chelsea had most of the possession during the first half but could not translate its dominance into goals.
Giroud was warming to the task of giving Southampton another headache and he went close to breaking the deadlock with an acrobatic volley before half-time.
Southampton, winless since November of a year ago, provided futile resistance and did not even came close to thwarting Chelsea's chances of winning a silverware this season, but the match belonged to the two Chelsea forwards and Eden Hazard. I am pleased to see them, I have another option, a card in my hand. "Clearly it's a match-defining moment. Why it wasn't referred I've no idea".
Pochettino is responsible for two of the setbacks, having also fallen short against Chelsea last season, plus lost the League Cup final in 2015. Manchester United last won the competition two years ago against Crystal Palace. Creating further interest in this match is the fact that neither United or Chelsea have won a trophy this season, and that this clash provides the final opportunity to do so.
The FA Cup final will also be "the rubber match" in the United-Chelsea series this season. The two have feuded on-and-off since Conte took the Chelsea job in 2016.
But Conte said: "With Jose we have clarified the situation, there is not a problem between him and I".
"When I don't win, you kill me", Mourinho told reporters.
"(Giroud and Morata) both got on the score sheet, so I am delighted with that, but most important was obviously just to get the win but they made it hard.
Lampard said: "It was a case of job done for Chelsea". If you don't concede you control the game, you create chances and we saw the result.