A bargain for the quality he has shown so far.
As a Grêmio fan I am even more aware of it.
But it's almost impossible to sell a midfielder for a higher price to Europe if he was not tested in Europe yet.
Most will think he may not adapt to faster pace etc. (which I do not believe tbh, but my opinion on this did not matter)
South American clubs don't have much bargaining power nowadays. The players want to go to Europe to be tested against the best. But it is a vicious cycle. The more South American players leave for that reason, the less quality in South America and thus, the more Europe becomes the only place to be tested against the best.
Imagine if all South American players returned to South America, how strong local leagues and the Libertadores would be.