United were made to work hard for all three points at St Mary’s yesterday with Romelu Lukaku’s goal the only difference between the two sides.
Southampton piled on the pressure in the second half and looked close to scoring an equaliser.
But United stood firm to clinch their fifth clean sheet in the league this season.
Mourinho has made a career out of closing out tough-to-beat teams with a rigid defensive live and he needed his forward players to defend from the front in order to keep up their defensive record.
And the United boss was delighted with the way that Rashford tracked back.
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“Marcus was phenomenal, he was phenomenal,” Mourinho told Sky Sports.
“Cedric [Soares] is a very good offensive full back, and [James] Ward-Prowse is a good crosser of the ball, so it was a good side.
“Marcus felt what everybody else felt in the team, if we don’t concede we win three points, so let’s fight hard not to concede.
“It’s not always possible to have high quality, but we fought hard. We fought hard. We did for 20 to 25 minutes what many teams in the Premier League do for 90 minutes, which is play with five at the back and defend with a low block.
“But credit to Southampton, they played, tried to play, they always try, Pellegrino sent a second striker in to play more direct to play more aggressive.
“It was a hard game, and we fought really hard, and I’m really happy.”