The Bayern Munich manager is puzzled by the business done by Spanish club in this transfer window.

Bayern Munich head coach Julian Nagelsmann has taken a swipe at Barcelona amid their spending spree in the transfer market this summer. The 34-year-old German coach has questioned the club's source of revenue which has enabled them secure several signings despite the public knowledge that the club is in financial crisis.

Behind the new-look Barcelona is still a canker to be address with the club presently posing €1.3 billion in debt. As it has been the case, the Catalans have had the trouble of registering players with in each of the two most-recent transfer window. According to Transfermarkt, the Camp Nou outfit have spent an additional €103 million on the signings of Raphinha and Lewandowski, having already secured the services of Franck Kessie, and Andreas Christensen for free.

On Tuesday, Barcelona confirmed the arrival of Robert Lewandowski, after reaching an agreement with Bayern Munich following about two months of negotiations. With the Bundesliga's all-time top goalscorer departing from the champions after his eighth season, his former side's manager was quizzed on how he felt about the move, to which he responded:

"It is the only club in the world that have no money, but then buy all the players they want.

"I don't know how they do it. It's a bit strange, a bit crazy."

Amid Nagelsmann's frustrations, the real concern for Barcelona is more about whether they can register player in accordance with La Liga regulations than if they have the money. The Blaugrana has more debt than any club in the world, despite mitigating and servicing it by reducing the wages of some of the club's top earners. While no apparent breakthrough can be seen in sight for the Catalans, the club has still been linked with moves for players such as Man City's Bernardo Silva and Sevilla's Jules Kounde.