Thanks to Garry Hill for sending this in:
I attended the Nottingham UK house show on Tuesday the 23rd of April and myself and my family sat front row near the ring steps.
Just before Cena put Ryback through a table with the AA he appeared to hobble to the right then stabilise himself.
Once Ryback was on the floor Cena lightly hopped to the ropes and pretended to tie his boot lace, whilst doing this he made an X to the medic and Justin Roberts and pointed to his right foot.
I have attended live events religiously since 2005 & this is the first event that Cena did not walk around the ringside crowd and sign autographs.
I'm guessing that this was when he injured himself on the European tour.