The consequences of Fernando Alonso's crash at Spa last weekend have extended to Monza, with McLaren forced to replace the Spaniard's written-off chassis.
The Woking-based outfit has built up a new car for the Italian Grand Prix based on a chassis used earlier this season, but the team was unsure on Thursday if the damaged MCL33's Renault power unit could be salvaged.
"We want to put it on tomorrow and confirm that everything is okay," said Alonso.
"There were some concerns on Sunday, then Monday and Tuesday they checked everything properly and it seems okay.
"So hopefully we can run still with that engine."
With Monza immediately following Spa, McLaren has found itself short of the latest-spec parts for this weekend's event as a consequence of the Spa wreck that also involved Renault's Nico Hulkenberg and Sauber's Charles Leclerc.
"We have enough luckily, but probably we've run out of spare parts, we have just what we have on the car. All the rest will probably be a different specification," explained Alonso.
"As I said, this is quite tough, because the damage on the cars was quite extreme, especially on my car. Then you have four days only to build a completely new car for Monza. It's the way it is."
Contrary to Stoffel Vandoorne, who took on new engine elements in Spa and a subsequent grid penalty, McLaren elected not to force a grid demotion on Alonso as it hoped the Spaniard could achieve a points finish in Belgium.
"Because of the penalty of Hulkenberg and Bottas and Sainz we opted not to change the engine in Spa, and benefit from the P14 starting position, and then on the first corner you're out of the race," said the two-time world champion.
"You will have to pay the penalty either in these race or later on, so it's a double zero – one in Spa because of another guy, and another one when you take the penalties. So quite a sad day."
Alonso also endured some personal pain as a result of the spectacular Spa collision, experiencing a very sore wrist and back.
"The only painful day was Tuesday," he added. "On Tuesday when I woke up I felt a little bit sore in the back.
"I’m still feeling some kind of heat (in the wrist), because I had the hands on the steering wheel when I touched Leclerc. But every day it’s less and less, and it should be OK for tomorrow."
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