Sauber to 'have a word' with its F1 drivers after US GP clash

Nasr and Ericsson clashed at the apex of Turn 1 early in the race with Nasr breaking his front wing, which forced him to pit while his team-mate was able to continue.

Nasr went a lap down after the team brought him in too early for slicks but he recovered to finish ninth, scoring points for the sixth time this season, while Ericsson retired on lap 25 when his engine shutdown.

"The bottom line of this is that these kind of things simply must not happen," Kaltenborn told Autosport.

"It is OK if you have decent and healthy competition which they do - both drivers are respectful to each other.

"But these kind of things must not happen. We will definitely have a word with both of them.

"I'm upset. These mistakes shouldn't happen. We are much better than this."

Nasr and Ericsson had differing views as to who was to blame for the clash.

"I made a good overtake in the last sector after we had a good fight," said Ericsson.

"Going down the start finish straight he was right behind me but then I came up against the first corner and it was yellow flags so I didn't think I had to defend.

"But he tried to make the move and ran straight into the rear of my car so we were lucky we did not have to retire both cars.

"The TV footage is clear that he hits my car quite hard."

Nasr said: "When you're on inters, people take different lines.

"Heading to Turn 1, I was pretty sure he saw me, but I don't think he did.

"I didn't intend to do an overtake move there, I just had the car on the inside for my line.

"Anyway, I was the one who got the damage, I had a broken front wing and that compromised my race."