Manchester City have spent £133m on Kyle Walker, Benjamin Mendy and Danilo and the Austrian international believes that is the result of a lack of quality in that position.
In an interview with Goal the 25-year-old said: "I guess you don't have as many quality full-backs at the moment and maybe five on the right side, three, two or five on the left side, full-backs who play at one level."
"I guess a very good full-back is not easy to find in the market right now."
"If you want to have a good one, I guess it's expensive."
For his part, Alaba has established himself as one of the finest left-backs in the world since joining Bayern as a youngster and he insists that he isn't paying any attention to speculation linking him with a move away from the club this summer.
'At the moment, I am good at Bayern Munich and I don't think about that," he said.
Strong words from Alaba, whatever happened to the defenders' union?