Education's plans to phase out the £2.8M annual subsidy to reinvest in State education face opposition.
The March debate on the States' funding of Elizabeth and Ladies College and Blanchelande is expected to divide political opinion.
Education argues the £2.8M annual government grant should be phased out and the money invested in States schools.
But now a number of political heavyweights have laid amendments to the policy letter.
Two former heads of Policy and Resources, deputies Gavin St Pier and Peter Ferbrache, want to keep funding the colleges.
They argue that they are an integral and valued part of Guernsey's education system and that the States subsidy should continue, but based on a per pupil model, with inflationary caps on States' support.
If this were to get sufficient political support, the States would have to give five years notice of any intention to reduce funding.
Deputies Peter Roffey and Yvonne Burford suggest funding should be reduced gradually over eight years, to 75% of the current level.
Deputies Neil Inder and Rob Prow want funding capped at current levels meaning inflation will gradually erode its value.
All three amendments suggest funding is based on a per pupil model.
The oolleges have jointly said that they want States funding to continue at its current level.
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