This double header will kick off at 6.15pm on Sunday, May 9 at the RDS and the Cardiff City Stadium. Meanwhile, the interprovincial derby match between Ulster and Connacht will take place on Friday, May 7.
The Magners League semi-finals will take place over the weekend of May 14-16, with the Magners League grand final scheduled for Saturday May 29 (kick-off 6.30pm).
Three teams have already qualified for the inaugural Magners League play-offs - Leinster, the Ospreys and Glasgow Warriors.
Three further teams, Munster, the Cardiff Blues and Edinburgh, are vying for the fourth and final qualifying spot.
MAGNERS LEAGUE - ROUND 18 FIXTURES:
Friday, May 7 -
Scarlets v Glasgow Warriors, Parc y Scarlets, 7.05pm
ULSTER v CONNACHT, Ravenhill, 7.30pm (live Setanta Sports Ireland)
Sunday, May 9 -
Cardiff Blues v MUNSTER, Cardiff City Stadium, 6.15pm (live Setanta Sports 1/S4C)
LEINSTER v Edinburgh, the RDS, 6.15pm (live Setanta Sports Ireland)
Ospreys v Newport Gwent Dragons, Liberty Stadium (date and kick-off time to be confirmed)
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