Didn't make any awesome saves, as most of Leicester City's shots were directed straight at him.
Rashford scored his ninth Premier League goal of the season in the ninth minute at the King Power Stadium when he controlled Paul Pogba's chipped pass exquisitely and fired an instinctive shot beyond Kasper Schmeichel.
Souness says Ole Gunnar Solskjaer's task was just to get the dressing room back on side and he is not yet convinced he is the right man to be the permanent United boss.
United's caretaker coach Solskjaer admitted that they could play better.
The Norwegian, who returned to Old Trafford in late December, has overseen eight wins and one draw since taking the reins.
"I think Marcus Rashford feels free, Jesse [Lingard] feels free, Alexis [Sanchez] also, Juan [Mata] when he played the other day and he was moving everywhere".
The 2018 World Cup victor has now managed six goals and five assists in United's eight league matches under caretaker boss Ole Gunnar Solskjaer, having thrived in more of a free role since the departure of Jose Mourinho.
Although the goal came early in the first half, United failed to create many clear chances for the remainder of the game, meaning it was a nervy watch for much of the second half.
United may not be able to win every game before the 2018-19 campaign comes to a close, but they are hoping to emerge successful enough to secure a top-four finish and continue progressing in the Champions League and FA Cup. That's important against a team like Leicester that want to counter-attack you. "Now for Fulham, then we will think about PSG".
"But you're away with three points, which is fantastic, a great reaction after last week's disappointment with the loss of two points and the performance against Burnley".