I would be more than grateful if you could bring more clarity on subcontractors participation in a clinical trial.

It is OK to subcontract in general. But it depends on the nature of the tasks. Core tasks cannot be subcontracted, they have to be done by partners. Minor tasks can be subcontracted. If subcontracting, you have to do so via procurement according to your organization's rules. So you cannot name the organization which will be subcontracted in the application. Dame