Ralf Rangnick joked Manchester United should let Cristiano Ronaldo travel to Portugal more often after he scored a hat-trick against Tottenham.
Ronaldo, who missed the 4-1 defeat by City on Sunday, scored all three of their goals in the 3-2 win over Tottenham to elevate United back up to fourth in the Premier League table.
Rangnick was unaware Ronaldo had flown to Portugal after he was declared unavailable for the derby and the 37-year-old only completed two full training sessions before the Tottenham game.