How to add coroutine to a running event loop?

[AlekseyPython]

Python 3.5

Initially, I launched several coroutine in ordered stages (which in the coroutine contain their tasks):

async def _create_workers(self):
    scheme = get_scheme()
    for stage in scheme.get_next_stage():
        await asyncio.gather(*stage)

loop = asyncio.get_event_loop()
loop.run_until_complete(self._create_workers())

But in the process of work, it became known that one of the coroutine doesn't have time to done with its tasks, and I want to add copies of it. I analyze the load from one of the coroutine ('main'- coroutine), which adds data for processing. But if I create new task I have to wait for the new coroutine to complete:

new_task = asyncio.ensure_future(slow_coro())
await new_task

But I don’t want to stop the execution flow 'main'- coroutine for waiting! I just want to add it to the current stage and so that the processing stage will finish only when the new coroutine is also completed.

How I can do it?