Bayern are eager to add attacking strength to their team this summer, having missed out on other targets like Florian Wirtz, Nico Williams, and Jamie Gittens.
Earlier this month, Liverpool rejected a £58.6 million offer for Diaz, who has expressed his desire to leave the club.
However, the situation has changed, and Bayern have been encouraged to make a second bid after Alexander Isak handed in a transfer request to Newcastle.
Liverpool are reportedly Isak's preferred destination, despite already signing Hugo Ekiteke from Eintracht Frankfurt this summer.
It's likely that Liverpool would need to break the British transfer record for a second time to secure Isak's signature from Newcastle.