United's city rivals Manchester City walked the 2017-18 Premier League campaign and lifted the trophy after becoming the first team to ever reach 100 points, so it's no surprise they are heavy favourites going into this season.
Chelsea shattered the world record fee for a goalkeeper with an 80-million euro (£71.6 million, $92 million) swoop for Athletic Bilbao's Kepa Arrizabalaga on Wednesday to replace Belgian worldwide Thibaut Courtois, who has joined European champions Real Madrid.
Southampton signed striker Danny Ings from Liverpool on a season-long loan before a permanent deal next year.
However, a move did not materialise and Mourinho must now work with the same central defensive setup as he did last season.More news: Barcelona name Lionel Messi new captain to replace Andres Iniesta
'I am not confident, ' Mourinho (below) said of United's chance of new signings yesterday morning.
"I actually think Liverpool will get the closest".
"Have the European clubs been holding back, almost, and waiting for the Premier League window to close?"
Australian teenager Daniel Arzani joined the English champions from sister club Melbourne City on Thursday but is expected to be sent on loan to Celtic.More news: Paul Merson defends Jose Mourinho about Man United transfers
Mourinho had warned that United face difficulties if they did not sign at least one more player after spending £75million on Fred, Diogo Dalot and Lee Grant this summer.
So far Tottenham's interest in Aston Villa midfielder Jack Grealish has been rebuffed with the Championship club holding out for a reported fee in excess of £30 million.
With the World Cup ending on July 15, the Premier League and Football League's decision to bring forward their deadline from August 31 prompted a rush of business.More news: Tiger Woods targets place on the USA Ryder Cup team