Don't know if Dutch people have a bookie for this too?
This is simply too big for Messi to score. Despite a new club/having to adapt to a new role, the odds should at least be lowered to Mbappé's anytime goalscorer-price @1.88. The price for this bet would be around 1.50-1.60 in Barcelona and Messi's quality should equal in a price a fair bit below 2.00 in my opinion. The goal against City could boost his confidence too. Betfair Exchange has this at 1.81.