Palou, who increased his points lead to 117 over Chip Ganassi Racing team-mate Scott Dixon, damaged his wing in a collision with a spinning Helio Castroneves that sent him into a concrete wall at the penultimate restart.
The secondary collision damaged the right-hand side of the nose structure, which allowed the front wing to pivot up on the left side and down on the right. The tear in the nose worsened in the final 10 laps, causing huge concern in both the cockpit and on the pit stall.
