After failing to win the match at Elimination Chamber, the 13 time WWE Champion John Cean showed up on Smackdown Live to continue  his road to Wrestlemania. He then challenged the present WWE Champion AJ Styles for the championship match. The speculation being that if Cena wins the wwe championship at Fastlane on 11th March in Columbus, Ohio, AJ Styles will have his rematch at Wrestlemania on 8th April this year.

Unfortunately, John Cena lost the Championship match to AJ Styles at the Fastlane. Since then, there are rumours floating that Cena may be involved in a clash with the legent "Undertaker" this Wrestlemania.
This started when Cena, on a episode of Monday Night Raw said that he never had a match with Undertaker at the grandest stage i.e Wrestlemania, although other mates have been atleast once.

It will be interesting to see how WWE makes a story out of this rumour and will "The Undertaker" return for "one more match" with John Cena at Wrestlemania 34 !