Red Bull Racing have turned up to Imola with a suite of RB21 upgrades — and Max Verstappen hasn't had a great first impression.

Red Bull team principal Christian Horner says Max Verstappen is free to let off steam in other motorsport series, but reaffirmed that the Dutchman’s “focus has to be” on Formula 1 following a secret test at the Nurburgring last week.

Red Bull's Max Verstappen is "not very" optimistic about his team’s chances of catching the leading McLaren pair in F1’s Imola GP