That's because the former Chelsea midfielder does not think the coach will get such a kick in the middle of the season as his future has been uncertain recently.
Reports earlier this week indicated that United Mourinho would spend more than £ 100m to win new players in January.
The Portuguese boss was frustrated a few months ago after being rejected in the summer by a towering center-back and a scorer whose spending was surpassed by Liverpool and Chelsea and even by Fulham, West Ham and Everton.
ESPN reports that United will find a new middle half at least in the next window, including Inter Milan ace Milan Skriniar, AC Milan Alessio Romagnoli and Fiorentinis Nikola Milenkovic.
That was after United joined forces with people like Harry Maguire, Jerome Boateng, and Toby Alderweireld in the summer, with the club's hierarchy not worth any of the three worth its reported value.
Burley, however, does not believe in suggestions that United is ready to assist Mourinho in the transfer market now, as the Portuguese were forced to sack just fourteen days ago.
The Red Devils seem to be stabilizing the ship after a rocky period on and off the pitch, but as United's future in the Champions League is far from guaranteed, Burley doubts that United would even be able to score goals for the club.
He told ESPN FC, "Why would you spend £ 100m in January if we talked about the years of donkeys that you will not get the best players in January?
"We can not even guarantee that United play in the Champions League in January because they are in a tight group with [Juventus and] Valencia
"Whom are you addressing yourself? I do not buy it Two weeks ago he was released within 48 hours, these were leaks from the club or the people of Mourinho, but it was potentially.
"Now he suddenly gets 100 million pounds in a transfer window that you do not normally spend. No."
Mourinho has regularly expressed his dissatisfaction because he did not achieve all of his desired goals during the summer. After a defeat in the Champions League against Juventus this month, he praised the Italian's approach to recruiting new players.
He said: "Juventus has been a champion for seven years, seven consecutive years, two Champions League finals in the last four or five years and not satisfied with what they have, they want more, they want more.
"They had [Gonzalo] Higuain, [Mario] Mandzukic, Dybala but they want more. you want to [Cristiano] Ronaldo you had [Andrea] Barzagli, [Giorgio] Chiellini, [Daniele] Rugani, they are not happy, they want more.
"You want to [Leonardo] Bonucci and they go for the best players in the world.
"Such a big, big club with a great past, but also with the great desire to have a great future and everything they lay there to win, I do not say [just] in the Champions League, I think to win the highs. "
And unlike the two teams, even though United's net cost has exceeded 450 million pounds in the past four years, Mourinho added, "Juventus had a different level of quality, stability, experience and expertise."
United did a remarkable deal last January signing Alexis Sanchez in a barter deal with Henrikh Mkhitaryan heading the other way to Arsenal, but the Chilean has been struggling since moving to Old Trafford.
Sanchez & # 39; s form and the misfire of strikers Romelu Lukaku and Marcus Rashford – with one goal in their last nine games – is one of the reasons for Mourinho's determination to sign another striker.