But he was quick to point out his United side were closest to runaway leaders Manchester City last season, even if they finished 19 points adrift.
Asked whether he he believed there would be any movement in or out of Old Trafford on deadline day, Mourinho replied: "The information I have is no".
"[Alexis is] more than ready but you can not have the players who arrived only last Monday after the World Cup semi-finals or final and three weeks' holiday".
United had been hoping to sign a centre-back before the deadline but hope has faded in recent days.
Mourinho had warned it would be a "difficult season" if United did not make any more acquisitions and it now looks like his side will miss out.
"I will have to focus on the players I have in relation to the first three matches, because after Spurs there is an worldwide break and I have a couple of weeks to recover people and prepare them better". As it stands, Alderweireld and Maguire are considered too expensive, while Bayern Munich have knocked back a loan move for Boateng. "[Sergio] Romero, [Antonio] Valencia, Marcos Rojo, [Diogo] Dalot, Ander Herrera, [Nemanja] Matic [are injured] and I think that's it".
Rudy Gay: Difference between Spurs, Raptors is 'night and day'
Outside of that, this is a pretty boilerplate "thank you" letter from the reserved forward as he starts his new chapter in Toronto.
"They return on Monday, trained Monday, Tuesday, Wednesday and today so you can imagine that they are not really fit and ready but we have needs", Mourinho said.
He said that he believes Liverpool will finish ahead of Manchester United in second place and Tottenham Hotspur will finish fourth despite a summer in which Mauricio Pochettino's team did not spend a penny in the transfer market.
"I think it'll be tough but if they were to go of the Champions league and they had free weeks after Christmas, Saturday to Saturday they could be a real threat this season to City". "When I listen, when I read, not much but sometimes I do, is hard to believe that we finished second, because you are capable of making people that finish second look like they were relegated, and people who win nothing, finish below us, and you make them look like serial winners".
"So it's hard for me to understand or to feel or to believe that we finished second, which I keep saying that I - and sometimes it's also hard to believe - that I won eight championships and three Premier Leagues".
"Like any big club, they need some silverware - in his first season at Old Trafford, 2016-17, Mourinho won two trophies - the League Cup and Europa League - but he won nothing last season".