I'm an experienced game designer with some sports games under my belt. I'm also a big sports fan and have broad knowledge of promotion/demotion systems, scores, individual awards, statistics, etc.
I'd need a better explanation regarding "refereeing and coaching structure", though.
My style of work would require daily communications with the client (I'd adapt to your time-zone) to report progress and make corrections on-the-move.
I hope we can work together.
Have a great day,
Manuel.