Street has named an unchanged pack for England’s RBS Six Nations Grand Slam-decider, but has made several changes to the back-line.

Worcester’s Katherine Merchant, who has scored an impressive 37 tries in 43 appearances for England, returns to the fold for her first game since the victory against Italy a month ago.

Street has moved Lichfield's Natasha Hunt from full-back to scrum-half, with the versatile Emily Scarratt taking her place at number 15.

Bristol's Kim Oliver will start at centre, while Street will also welcome back Saracens flanker Hannah Gallagher.

England are targeting a record seventh successive Six Nations crown but Street is wary of Ireland’s threat from the wings.

“This has been Ireland's best ever Six Nations season,” said Street.

“They will be really up for it and we will be taking nothing for granted. They have got great pace out wide, a good set-piece and Niamh Briggs' kicking game is impressive.”

England’s captain Katy McLean also urged caution ahead of the fixture, which could still see Ireland take the Six Nations title if they defeat England and score 24 points or more.

“Ireland are really performing at the moment. You can't underestimate them at all,” said McLean.

“The game is on St. Patrick's Day and they will undoubtedly be coming here to spoil our party.”

If Ireland are to overcome the odds they will need to find a way through England’s formidable defence, which has yet to concede a try during this year’s tournament.

McLean praised England’s ‘outstanding’ defensive performance during the tournament so far, which has been the backbone of England’s 100% record.

She added: “As a captain it is great to know we are not a side that leaks points as we are not going to be able to get away with that against Ireland.”

Ireland, who have won all three of their games since narrowly losing their opener against France by one point, will be attempting to win their first ever Triple Crown title.

Ireland’s head coach Philip Doyle has made just one change to the team that defeated Scotland 20-0 last weekend in Ashbourne, with Gillian Bourke returning at hooker in place of Paula Fitzpatrick who drops to the bench.

Doyle said: “We have been very lucky this tournament, we haven’t had to make too many changes and the depth in the squad is very strong.”

“We are very realistic in our outlook and firmly believe we have closed the gap to put in a significant challenge on Saturday.”