Alonso topped Thursday's two practice sessions in Monaco
Fernando Alonso's hopes of winning the Monaco Grand Prix were dashed when he crashed in practice and was unable to take part in qualifying.
The Spaniard smashed into the barriers at Massenet 20 minutes into the final session and wrecked his car's chassis.
The damage could not be repaired in time for the two-times Monaco winner to make qualifying and Ferrari did not have enough time to prepare a spare.
Alonso will now start Sunday's race from the pit lane in the spare car.
Alonso, who admitted the crash had been his own fault, said he still hoped he could salvage a points finish.
"These things happen and you can't do anything about it," Alonso said. "It's difficult to start from last place in Monaco but it's a long race and in 2006 (Michael) Schumacher started last and finished in fifth so the goal is to score some points. We'll see if we are that lucky."
And he admitted the error could come back to haunt him later in the season.
"It's still too early but if I lose the championship for a couple of points, then no doubt it could be because of this," he said.
The double world champion, who set the pace in both of Thursday's practice sessions, was top of the timesheets in final practice on Saturday when he lost control at the tricky 100mph corner Massenet and scraped the right hand side of his car along the barriers.
"I lost the car. It was driver error," admitted the 28-year-old.
"I locked the front left tyre and I went straight into the wall. It was a little bit also (an) unlucky situation. If I crash 100 times, 99 (times) I will never break the chassis. But this time it happens, so (there's) nothing you can do."
Alonso came to Monaco second in the drivers' championship, three points behind leader Jenson Button of McLaren but he will have his work cut out to significantly add to that tally on Sunday.
Overtaking is notoriously difficult on the tight twists and turns of Monaco's famous street circuit, where the man on pole position has won the race for five out of the last six years.