United's boss, about to begin his third season at the helm at Old Trafford, has cut a disgruntled figure during the summer, apparently unhappy with the club's transfer window activity.
Liverpool FC placed in fourth spot and finished 25 points behind Manchester City, although the Reds knocked the Citizens out of the Champions League thanks to a 5-1 aggregate win in the quarter-finals.
"I'm not confident", he said.
"I will have to focus on the players I have and in relation to this first couple of matches".
"I think the early closing of the window appears to have made clubs more reticent to sell players to other clubs in the Premier League", Bridge told Press Association Sport.
Asked if nothing would happen in or out before the Premier League deadline at 5pm, he said: "The information I have is no (nothing will happen)".
United had been hoping to sign a centre-back before the deadline but hope has faded in recent days.
"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. It is widely expected that consumer demand to watch the world's best football talent competing in the Premier League, which includes some of the best players of countries in MENA, will only continue to grow further as the next FIFA World Cup - the first ever to be held in the region in Qatar 2022 - draws closer.
"My view is that, first of all, is hard for me to believe we finished second", he said.
"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".
"But I keep saying and thinking and feeling that the second last season was one of my biggest achievements in the game".