The news comes two days after Mako Vunipola was ruled out of the round three fixture for family reasons that have forced his return home to Tonga.
Obano returned to his club Bath on Wednesday after becoming one of the six players culled from England’s 33-man squad, but has been summoned back to England’s camp and will train on Thursday afternoon.
If Marler or Genge do fail to recover in time, then Obano will make his Test debut against Ireland.
WATCH: England head coach Eddie Jones was forced to apologise after making a bizarre remark about racism that has invited renewed scrutiny of his England regime.
“Beno’s on the freight train, just in as a bit of cover. As I said we’ve got a few niggles so we just needed an extra prop in there,” Jones said.
This is how you sign off.
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“The Six Nations is a contest competition. It’s all about the contest at the set-piece, in the air or on the ground. Or both,” Jones said.
“There’s no guessing out there, the Six Nations is a pretty simple game. You’ve got to win the set-piece, win the ground and win the air.
“Ireland are a very well coached team. We respect their back row so we’ll have to be good in that area. Ireland are an all-round well coached side.
“They’ve got good players, so we don’t see one area being stronger than another. We’ll take them on their merit and we’ll need to play well.”More News
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