The Wycombe MP met with Buckinghamshire Healthcare NHS Trust chief executive Neil Macdonald to discuss the hospital's future.
Reynolds said: ‘I know many constituents are concerned about the future of Wycombe hospital.
‘During my last meeting with the chief executive of Buckinghamshire Healthcare Trust, Neil Macdonald, I was encouraged to hear about their plans to develop the hospital.
‘I have offered my steadfast support. We must not lose any additional services from our hospital.'
A spokesperson from Buckinghamshire Healthcare NHS Trust said: ‘We are committed to the redevelopment of Wycombe Hospital.
‘It looks very unlikely that Wycombe will be included in the New Hospital Programme (NHP), so we are looking at alternative ways of delivering the changes that are so desperately needed.'
The trust has warned the hospital's eight-storey tower, which was built in the 1960s, will not be fit for clinical use within five years.
It said its exclusion from the NHP will mean any building to replace the tower will be constructed in a phased way when funding becomes available.
A spokesperson said: ‘The first stage will be to complete preparatory work, including things like ground investigations and utilities, before starting on detailed designs to allow us to gain financial approval to proceed in late 2026.
‘In the meantime, we are continuing to undertake essential maintenance work to ensure the safety of our patients and our colleagues. We would like to thank everyone for their patience as we continue to do our best to deliver outstanding care in an environment that we know is less than ideal.'