"Amid speculation that the Cenation leader would not be cleared to compete at The Biggest Party of the Summer, Cena accepted (with Daniel Bryan's support) Rollins’ challenge during an appearance on the Aug. 11 edition of WWE Tough Enough".
CREDIT/ WWE.COM/ FULL ARTICLE
There you have it... John Cena and Seth Rollins will compete at Summerslam in a Title vs Title match as he confirmed on Tough Enough. Not sure if there was much doubt considering we know how tough Cena is. Going to make this match that much more interesting to see how Cena responds to the broken nose!!