Felipe Massa blamed tyre degradation for his failure to secure a first podium finish of the season at Sunday's Italian Grand Prix.
Massa, who is fighting to keep his place at Ferrari, enjoyed his most competitive race of the year.
The Brazilian was second for most of the race, before being overtaken by Sergio Perez and allowing championship leader Fernando Alonso through on team orders.
“I worked for the team, trying to help Fernando, which is as it should be. I have always done it and will do it whenever it’s necessary,” Massa said.
"I'm pleased with the result, even though I was hoping to make it to the podium," he added. "We faced massive tyre degradation, higher than we expected, it was really amazing ... very different to what we had seen on Friday in free practice.
"It's a shame because while the tyres were still working, I could match the pace of the McLarens, but then I began to lose the rear end earlier than they did. It was not an easy race towards the end. Perez came back at me very strongly and there was nothing I could do to fend him off," the Brazilian explained.