It is very likely that Endrick, the wonderkid, will replace Joselu role as Ancelotti second tier player and Endrick will appear more often in La Liga when Mbappe match schedule becomes busier.
Madrid is serious about bringing in Endrick as a replacement for Joselu, Madrid is willing to spend €60 million for the young player.
Real Madrid has officially signed Endrick from few months ago, but he will join the squad in the next month. So, it's not about Endrick anymore, but Real Madrid choose to not sign Joselu because Endrick's performance in friendly match against Mexico make them satisfied.
I agree that Ancelotti don't want to sign Joselu, they don't need to have three strikers because it's too much.