The Premier League's transfer window closes on Sept. 1, the deadline for most of Europe's top leagues, but Saudi Pro League clubs can sign players until Sept. 20.
Liverpool have already seen three of their key players move to Saudi clubs, including skipper Jordan Henderson and fellow midfielder Fabinho while striker Roberto Firmino moved on a free transfer.
"The influence of Saudi Arabia is massive at the moment," Klopp told reporters on Tuesday, a day before their pre-season friendly against Bayern Munich in Singapore.
"Pretty much the worst thing I think is that the transfer window in Saudi Arabia is open three weeks longer.
Mbappe has also been linked with a world record move to Saudi Arabia, but media reports said he rejected the idea of playing in the Gulf kingdom as he eyes a transfer to Real Madrid.
Persons:
Juergen Klopp, Jordan Henderson, Fabinho, Roberto Firmino, Klopp, Ballon, Karim Benzema, N'Golo Kante, Nassr, Cristiano Ronaldo, Frenchman, Mbappe, I've, Rohith Nair, Muralikumar Anantharaman, Christopher Cushing
Organizations:
FIFA, Liverpool, Saudi Pro League, Bayern Munich, UEFA, World, Al, Paris St Germain, Real Madrid, Sky Germany, Thomson
Locations:
Saudi, Saudi Arabia, Singapore, Europe, Qatar, Portugal, Bengaluru