Mosimane mamelodi sundowns have two new signings for the champions league

I think there may be some confusion here!

Mamelodi Sundowns is a South African football club that plays in the Premier Soccer League (PSL), not the UEFA Champions League. The UEFA Champions League is a European club competition, and Mamelodi Sundowns has not participated in it.

However, if you're referring to the CAF Champions League, which is the top club competition in African football, Mamelodi Sundowns has indeed participated in it and has won the title several times. But I'm not aware of any recent signings that would be relevant to the Champions League.

If you could provide more context or clarify which league or competition you're referring to, I'd be happy to try and help!