Ferrari's Formula 1 head of race activities Jock Clear says the team will have to "work hard to cover the gaps" following James Allison's departure as technical director.
It was confirmed this week that Allison was leaving the team, with Mattia Binotto moving from a role as Ferrari's engine boss to become chief technical officer.
Clear said: "In the immediate aftermath, you are not going to find losing someone like James Allison, a man of his calibre, is going to go unnoticed in the team.
"The team is going to have to work hard to cover the gaps - Mattia will need help and we have to pull together.
"There is no suggestion he can step into the role James was doing and cover the background, but Ferrari is committed to pulling together in the areas where James was strong.
"That's the challenge for all of us, and he will be missed."
Clear said the death of Allison's wife in March had a huge effect on everyone at Ferrari "emotionally and practically".
He added: "I've not seen Ferrari in the most enjoyable light with that hanging over us.
"But the team is a very motivated team, a very passionate team, and there is a will to win.
"That passion can be an Achilles heel that holds us back.
"But that passion is what will get us over the finishing line, will drive people.
"That's the biggest factor for me - that passion running through the company is fantastic."
Allison's future in F1 remains uncertain, although Autosport understands Renault, where he worked previously in its Lotus guise, is still hopeful of recruiting him.
It is understood Allison is considering his options for the next few weeks before taking a decision on his next move.