Patrick Mahomes is gearing up to sign a 10-year extension with the Kansas City Chiefs and everyone is curious to see how much the gunslinger is set to make. While the exact numbers aren't official yet, there are more details emerging about Mahomes' contract extension, per ESPN's Adam Schefter.

Once the news broke out that Mahomes would be receiving an extension, everyone was anxious to see the numbers involved in the deal. Mahomes, who's coming off of his first Super Bowl victory, has proven that he's invaluable to the Chiefs.

Therefore, it was already expected that the former No. 10 pick would garner the richest contract in NFL history. Provided that, it shouldn't come as a surprise that Patrick Mahomes' new deal is going to be worth an excess of $400 million in total. With that being said, it remains to be seen how much more Mahomes makes than the reported $400 million.

Seeing that the extension is for 10 years, some are wondering why Mahomes would sign on the dotted line. However, as Schefter reports, his new extension will likely give him a percentage of the salary cap each season.

Also, Patrick Mahomes still has two years remaining on his rookie contract — with $2.8 million coming in 2020 and $24.8 million in 2021. With that in mind, as Schefter highlights, the minimum that Mahomes' extension can be is $427.6 million over 12 years.

The moment that Mahomes' new extension becomes official, he will become not only the richest player in NFL history, but he'll also boast the richest contract in sports history. Until the numbers are revealed, everyone can go back to refreshing their Twitter feed for Schefter to break the news.