Riordan and Duffy to swap for Connacht
John Hearty, Peter Durcan, Michael Swift and Ray Hogan all return to Connacht's first fifteen at the expense of Darren Yapp, Paul Warwick, Ray Ofisa and Stephen Knoop for the final Magner's League tie of the season away to Llanelli on Friday.
Connacht's two members of the Irish U20 Six Nations grand slam winning side, Aidan Wynne and Andrew Browne are posted on the replacements bench.