Mauricio Pochettino has once again claimed that Tottenham may end the summer without signing a player, but insists he is "not the person to explain it".
Spurs are the only club in the Premier League not to reinforce their squad this summer, despite continued links with Manchester United forward Anthony Martial, Aston Villa's Jack Grealish and Bournemouth's Lewis Cook.
Villa manager Steve Bruce claimed on Friday that Spurs are "nowhere near" Villa's valuation of Grealish, despite talks taking place throughout the summer.
Pochettino has reiterated his previous comments that Spurs could end the summer window, which closes next week, without making a single transfer, and appeared to hint that chairman Daniel Levy is struggling to get deals over the line.
"Yes. We are working so hard but still we are like it's the first day of the transfer window – with no signings," he told a press conference.
"I think I am not the person to explain it.
"Of course, people expect the manager to explain that but, for different reasons, it's been difficult to add players who can help us. But in the last week many things can happen."
Pochettino admits that he is not calm about the situation, but believes that he has a back-up plan should Spurs fail to make any additions.
Indeed, the likes of Oliver Skipp and Luke Amos, who were promoted from the Under-21s and impressed on the club's pre-season tour of the United States, may well be called upon, with Pochettino forging a reputation as a coach who brings through young players.
"I'm not relaxed because I'm a coach and you cannot be relaxed," he added.
"I think you need to be confident and trust in the people we have and the way that we work.
"Of course, football is all about adding more quality every season like our rivals are doing.
"If we cannot do that, we need to try to be creative and, of course, the help of younger players will be amazing and they showed they can help us if, in the end, we cannot sign players."