C# Mediatr Request Handler Injected with multiple Repositories

Im using MediatR in .Net Core and kind of confused if injecting multiple repositories to handle a business logics is an acceptable/clean way of doing it?

My sample Code:

public class MyRequestHandler: IRequestHandler<...>
{
  public IHeaderRepository _headerRepository;
  public IChildRepository _childRepository;
  ///constructor dependency injection happening here

  public async Task<...>Handle(.....request,..... cancellationToken)
  {
     var header = await _headerRepository.GetHeader(..headerId);
     if(header != null) await _headerRepository.Insert(...):

     await _childRepository.Insert(..., ...headerId)
  }
}