54% win rate in the Champions League with Ajax. Averaging 2 goals a game, conceding 1 a game.
To put that into perspective. Antonio Conte has a win rate of 35%, 12 wins in 34 games despite managing at Juventus, Chelsea and Inter. Pochettino has a win rate of 46% in the Champions League, despite managing at Tottenham and PSG. Bit unfair to quote Brendans numbers but given he's linked to the job, feck it. He's got a 11% win rate in the Champions League with Liverpool, Celtic. Pep Guardiola has a 64% win rate, Tuchel 63%, Zidane 60%, Klopp 55%.
In terms of European football, he's excellent. In the 7 games he's lost, they've all been by a 1 goal margin too. Never once has his team been spanked.