Yuki Tsunoda admits that it is "unusual" that he has not spoken to Helmut Marko since his Red Bull promotion.

Marko, a Red Bull senior advisor, works very closely with Max Verstappen and oversees the junior drivers within Red Bull.

But he has not reached out to Tsunoda ahead of his first race with the team, having replaced Liam Lawson.

"The first call I got was from Christian right after China, that I should maybe be prepared for when things are going to change a little bit," Tsunoda said. "I guess it was Tuesday or something like that.

"Surprisingly, [Marko] didn't call me yet, very unusual. So, I'm not sure if he was busy with other things. I can't wait to see him, how he's going to react to me [moving]. But yeah, it's very unusual.

"From F3 to F1, he was always calling me, but this time he didn't call me. So, I'm sure there's not anything from his side. We have still a good relationship, so let's see how he reacts to that."