An investigation is underway into the conduct of a teacher at a Spalding secondary school.
The Spalding Grammar School teacher, who has not been identified, is currently suspended until the investigation is complete.
Headteacher Nigel Ryan said he was unable to elaborate on the nature of the allegation against the teacher, but assured parents it had nothing to do with current students at the school.
He said police had initially been involved when the matter came to light but no further police action had been necessary.
He also said he hoped the school’s in-house investigation would be complete by Christmas and parents would be informed at that time if there was anything they needed to know as a result.
Mr Ryan also confirmed another teacher, who only started at the school in September, had left after something came to light which they had not disclosed at the time of their appointment.
Again, he was unable to elaborate, but said it did not affect the school’s pupils.
Mr Ryan added: “I can assure parents neither of these matters affect the students other than in the sense of staff not being there, but we have taken all necessary steps to make sure that their education is not adversely affected and that new teachers are found to replace them as quickly as possible.”
Chairman of governors the Rev John Bennett defended the school against claims parents should have been told of the teacher’s suspension, saying it would be unfair to tarnish his reputation if the allegations were found to be untrue.