Maintenance for Guernsey's La Mare de Carteret High School may cost millions if plans for redevelopment are turned down, the director of education says.
The school is next on the department's list to be re-built, after Les Beaucamps High School, but funding has yet to be assigned to the project.
Derek Neale said under the capital prioritisation programme it would compete with other projects for money.
He said: "We're hoping to... bring this next one along in the next few years."
Work on the redevelopment of Les Beaucamps at the cost of £37m began in December and is due to be completed by the end of 2011.
Education Minister Carol Steere said if the money for the work on La Mare de Carteret was not found it would break a States resolution made 10 years ago to retain the 11 plus and provide three new secondary schools.