Grace pulled up unchallenged, in the final minute of Saints’ defeat to Salford on Sunday and scans have unfortunately revealed the worst.

He will now undergo surgery to repair his ruptured Achilles before he moves to French Rugby Union side, Racing 92 at the end of the season.

Head coach Kristian Woolf confirmed the news: “Regan has unfortunately ruptured his Achilles and it is a devastating blow for him and for us as a team and a Club as well.

“Regan has come through our Academy and has been a big part of our club and team for a long time. He is a really valued player and person who has been a big part of our success over the last couple of years.”

In his pre-match media conference ahead of Sunday’s game against the Castleford Tigers, Woolf was keen to stress that a replacement for Grace will be found within his own squad, with Jon Bennison the name that stands out.