Mauricio Pochettino has confirmed that Chelsea is aiming to secure at least two more signings before the transfer window closes, as he expresses frustration over the club's "unfortunate luck" with injuries.

Despite already investing over £320 million ($404 million) this summer, Pochettino believes there's a need for further reinforcements due to the growing list of injured players. Ahead of their Premier League home game against Luton, the team is facing the absence of nine players.

Adding to this, Mykhailo Mudryk sustained a minor injury during training this week, and Carney Chukwuemeka recently underwent knee surgery, projecting a six-week recovery period. Although new signing Romeo Lavia is fit, he won't debut for a few weeks while he works on match fitness.

Given the current situation, there's a heightened determination to bolster the squad by September 1. Among the expected additions, New England Revolution goalkeeper Djordje Petrovic is set to undergo a medical before his anticipated £14 million transfer. Chelsea is also exploring potential moves for Brennan Johnson from Nottingham Forest and Folarin Balogun, the United States international from Arsenal.

"We need at least one keeper," Pochettino said on Thursday. "We have very talented young keepers, but they need time. We need more and then we were talking about one offensive player with the right profile.

"If we can add the right profile, yes, but not to bring players so we can add one more. We don't want to stop the evolution of some young guys, Broja, Nkunku. Working hard but not taking a decision because we need someone. These two areas, we may need some players.

"We are trying to find the right profile. The most important thing is the profile of the player we need to add to the squad so it won't be a problem and they can be compatible. That is why it is not easy but yes, we are trying to do something.

"It is open, the transfer window is open, and the club is working, and yes, some players are rumoured to be with the club, maybe true or not, we will inform you when something happens."

Pochettino believes there is no overarching reason why Chelsea have suffered so many fitness problems.

Wesley Fofana, Christopher Nkunku, and Armando Broja have all sustained serious knee injuries -- the latter in December prior to Pochettino's arrival.

Benoit Badiashile and Marcus Bettinelli were also injured last season and are yet to return, while Trevoh Chalobah was injured in pre-season and Reece James suffered a hamstring problem in training.

"Many of them are bad luck," continued Pochettino. "Nkunku and Carney or Fofana. How can you control it? It's not about training or training hard or less or too much or methodology. It sometimes happens.

"In some others, many factors can influence. It's difficult to talk in general because situations are different. Also the past. Many factors are there.

"We need to talk about Carney, we need to talk about Broja, about Mudyrk, and explain why but it is difficult to explain why. In general you can talk about bad luck or bad training session, many factors can influence it. For sure, it is bad luck in Carney, Broja, Fofana, and Nkunku."

Pochettino also insisted he is "relaxed" about Romelu Lukaku's uncertain future, despite still not having talked to the striker since becoming head coach on July 1.

Chelsea want to offload Lukaku but are yet to receive a satisfactory offer from Juventus -- which is thought to be the Belgian striker's preferred destination after rejecting interest from the Saudi Pro League.