Speaking on BT Sport's highlights show on Saturday evening, De Boer had said: "It is a pity that the manager is Mourinho".
If he was coached by Frank he would be coached how to lose because he lost every game.
De Boer won four straight Dutch league titles as Ajax boss between 2011-2014.
However, Mourinho made a decision to switch Rashford to the ring wing, with Alexis Sanchez on the left and Jesse Lingard in behind Romelu Lukaku.
No player has featured more times for United in Mourinho's time as manager than Rashford.
"He scored two goals in a big match against a top class opponent".
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His tweet said, "Due to the fake fights and the collusion between BJP and AAP, traders are facing a lot of damage". From AAP, among those who were present included AAP's Rajya Sabha MP Sanjay Singh and MLA Somnath Bharti.
Southampton dismissed Pellegrino on Monday after just one victory in 17 league games under the manager. "I am upset with the reaction they had with Scott McTominay, a kid who was making all the right decisions and they want him to make the wrong decisions", he said.
Moreover, back in 2016, United legend Paul Scholes had also stated: "You've not seen any yet, but Rashford hits free kicks in a dipping fashion, nearly the way Cristiano Ronaldo does". Today if he (Pawson) would see it, it is a draw.
"The first leg leaves everything open for tomorrow", added Mourinho. "I think we deserved the three points".
"They tried to do the right thing by the fans, in terms of not selling their best player every season, but sadly that did appear to backfire, and that situation probably didn't help the performances in the first half of the season".
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Mourinho believes they are still some way off the European elite, but believes from his experiences of winning the competition with Porto and Inter Milan, anything is possible if they make the last eight.
"In these types of games, when the pressure is on you, you just be yourself and I think that's what seems to happen in these games and the team seems to react well, when maybe we don't react as well in other games", said the 20-year-old.