But the deal was overshadowed by Bayern boss Julian Nagelsmann launching a scathing attack on the Catalan club. 4 Robert Lewandowski confirmed as a Barcelona playerCredit: Instagram @fcbarcelona 4 The former Bayern star has signed a four-year deal at the Nou Camp with a £426m release clauseCredit: Instagram @fcbarcelona Lewandowski, 33, was forced out of the Allianz Arena and put pen to paper on a four-year deal at the Nou Camp. The transfer sees Barca pay £38m with a further £4m in add-ons – with that money already reinvested in the signing of Matthijs de Ligt. His release clause is set at a staggering £426m should anyone attempt to buy the Poland international. Barca agreed a deal three days ago and now Lewandowski has said goodbye to his old boss and team-mates, flown to Miami to meet his new team and passed his medical. But Nagelsmann and Bayern are noisy. There was already bad blood between the two clubs after last year’s failed breakaway European Super League. And now the relationship has soured as Barca – who were £1bn in debt last year – somehow managed to land another big signing. Nagelsmann told Bild: “Barcelona, ​​the only club that doesn’t have money but then… they buy every player they want. FREE BET AND SIGN UP OFFERS – BEST NEW CUSTOMER OFFERS “I do not know how [they do it]. “It’s kind of weird, kind of crazy.” In January, Barca brought in Ferran Torres for around £45m and this summer’s spending has topped £90m following the arrivals of Lewandowski, Pablo Torre and Rafinha. 4 Julian Nagelsmann hit out at Barcelona to complete the dealCredit: EPA 4 The coach said goodbye to Lewandowski over the weekend Source: AP