Daniel Ricciardo believes Red Bull has turned into "a beast" since his initial departure.
The Australian left the team at the end of 2018 to join Renault [now Alpine], spending two seasons at Enstone before struggling to make an impression with McLaren.
Ricciardo finds himself back in Milton Keynes as third driver to Max Verstappen and Sergio Perez with his duties set to include commercial activities, such as show runs, as well as simulator work.