Ospreys head coach Steve Tandy admits all of their hard work in the RaboDirect PRO12 this season comes down to their crunch clash with Leinster on Friday.

The Welsh side need a win to have any hope of securing a play-off spot, but even then they could be left empty-handed if fourth-placed Scarlets pick up a victory at home to Treviso.

Ospreys face a Leinster side in need of a victory themselves to secure a home semi-final but Tandy has included four of their British & Lions in the squad – captain Alun Wyn Jones, Adam Jones and Justin Tipuric in the pack, while second-row Ian Evans is named on the bench.

Tandy will be hoping they inspire a return to winning ways after their five-match unbeaten run in the PRO12 ended in the last round with their 17-35 reversal in Glasgow.

But the Welsh side will be buoyed by the fact Leinsterhave won just one of their last seven contests with Ospreys: 15-10 at the RDS in January 2011.

"All the hard work of the last nine months rests on Friday evening,” said Tandy.

“I was extremely disappointed with our performance up in Glasgow last time out. We didn't do ourselves justice and that defeat has opened the door for the Scarlets, allowing them to jump ahead of us with one game to go.

"We know that we're up against it if we are going to reach the play-offs but we definitely won't be throwing the towel in.

“This team isn't about that, it's about playing for the cause and giving everything. The boys were hurting badly in the dressing room in Glasgow and are desperate to not go out with a whimper. We still have a chance of progressing so Friday night will be about giving it everything.

“If we can put in the kind of performance that's needed then we'll have to wait and see what happens elsewhere.”

Leinster coach Joe Schmidt, meanwhile, has shuffled his pack and made seven changes to his side.

Jack McGrath, Sean Cronin and Jamie Hagan come in for Cian Healy, Richardt Strauss and Mike Ross while Quinn Roux replaces Devin Toner in the second row.

There are two injury-enforced changes in the back row; Rhys Ruddock replaces Kevin McLaughlin at blindside and Seán O’Brien takes over from Jamie Heaslip at No.8 while Andrew Conway comes in on the wing – Brian O’Driscoll is named on the bench.

Schmidt will take confidence from the fact that Leinster have lost just once to a Welsh region in all competitions this season, but that was a 10-19 loss at the Ospreys in round eight of the PRO12.

Leinster's only defeat in their last 14 contests was 18-22 at home to Ulster in the RaboDirect PRO12 on March 30, and Schmidt, who will leave to take on the Ireland post next season, wants to continue that fine form.

He said: “I’ve benefitted massively from having a superb management staff and a super playing staff at Leinster who have been incredibly motivated.”

At RDS , 7.45pm.

Referee: Nigel Owens (WRU, 98th competition game)

Assistant Referees: Mark Patton, Stuart Gaffikin (both IRFU)

Citing Commissioner: Eugene Ryan (IRFU)

TMO: Alan Rogan (IRFU)

Live on TG4 and S4C