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Gloucester v Ospreys </div>
Venue: Ricoh Arena, Coventry Date: Saturday 28 March Kick-off: 1430
Gloucester are without ex-All Black Carlos Spencer, who is cup-tied after playing for Northampton in the EDF Energy Cup group stages.
Ryan Lamb will start at fly-half for the Cherry and Whites.
The Ospreys prefer Jamie Nutbrown to Mike Phillips at scrum-half for Saturday's EDF Energy Cup semi-final clash against Gloucester.
Gavin Henson fills in for injured full-back Lee Byrne and Jonathan Thomas' recurring groin problem rules him out.
Mike Tindall and Marco Bortolami return from Test duty for the Kingsholm side while wing James Simpson-Daniel is fit again.
Ospreys boss Sean Holley said: "Saturday's game marks the start of a huge month for us as we look to keep alive our involvement in three competitions.
"It's going to be a difficult period in terms of rugby, but it's an exciting time, everything we've done as group over the last eight months or so has been geared towards being in contention on three fronts come the end of March, and here we are."
Holley added: "The EDF trophy has done a lot for us. It has put us on the map with our English and European counterparts. It shows we can go to the home of English rugby and win a major competition.
"When we set our targets at the start of the year, we wanted to be in all competitions at this point of the season and we've achieved that.
"You reassess your goals and I don't think the group has changed their views."
Gloucester head coach Dean Ryan said: "The EDF tends to get parked for a number of weeks and here we are back in the semi-finals and these are the games that we're looking for when you get the quality of the opposition like the Ospreys.
"We've got to go to a football stadium, an unknown to both of us, and we've got to get a result and hopefully put ourselves in the final.
"You've got to look at how you can beat them. They're a side that offer you so much threat you've got to be good at just about everything.
"With some sides you can say if we can cope with this we can cope with the majority of their pressure. But the Ospreys have threat all over the field and we need to be good at pretty much all aspects of the game to give ourselves a chance."
Route to the semi-final:
Gloucester beat Wasps, Newport Gwent Dragons and Newcastle in their group to reach the semi-final.
Ospreys came through the group stage with wins over Harlequins and Worcester to book their place in the last four.
Gloucester: Morgan; Balshaw, Tindall (capt), Allen, Simpson-Daniel; Lamb, R Lawson; Dickinson, Azam, Somerville, W James, Brown, Strokosch, Hazell, Delve.
Replacements: S Lawson, Nieto, Bortolami, Qera, Cooper, Barkley, Watkins.
Ospreys: Henson; Bowe, Parker, Bishop, Williams; Hook, Nutbrown; P James, Hibbard, A Jones, Gough, Lloyd, Smith, Holah, R Jones (capt).
Replacements: Bennett, Griffiths, A-W Jones, Tiatia, Phillips, Biggar, Spratt.
BBC Sport
Gloucester v Ospreys </div>
Venue: Ricoh Arena, Coventry Date: Saturday 28 March Kick-off: 1430
Gloucester are without ex-All Black Carlos Spencer, who is cup-tied after playing for Northampton in the EDF Energy Cup group stages.
Ryan Lamb will start at fly-half for the Cherry and Whites.
The Ospreys prefer Jamie Nutbrown to Mike Phillips at scrum-half for Saturday's EDF Energy Cup semi-final clash against Gloucester.
Gavin Henson fills in for injured full-back Lee Byrne and Jonathan Thomas' recurring groin problem rules him out.
Mike Tindall and Marco Bortolami return from Test duty for the Kingsholm side while wing James Simpson-Daniel is fit again.
Ospreys boss Sean Holley said: "Saturday's game marks the start of a huge month for us as we look to keep alive our involvement in three competitions.
"It's going to be a difficult period in terms of rugby, but it's an exciting time, everything we've done as group over the last eight months or so has been geared towards being in contention on three fronts come the end of March, and here we are."
Holley added: "The EDF trophy has done a lot for us. It has put us on the map with our English and European counterparts. It shows we can go to the home of English rugby and win a major competition.
"When we set our targets at the start of the year, we wanted to be in all competitions at this point of the season and we've achieved that.
"You reassess your goals and I don't think the group has changed their views."
Gloucester head coach Dean Ryan said: "The EDF tends to get parked for a number of weeks and here we are back in the semi-finals and these are the games that we're looking for when you get the quality of the opposition like the Ospreys.
"We've got to go to a football stadium, an unknown to both of us, and we've got to get a result and hopefully put ourselves in the final.
"You've got to look at how you can beat them. They're a side that offer you so much threat you've got to be good at just about everything.
"With some sides you can say if we can cope with this we can cope with the majority of their pressure. But the Ospreys have threat all over the field and we need to be good at pretty much all aspects of the game to give ourselves a chance."
Route to the semi-final:
Gloucester beat Wasps, Newport Gwent Dragons and Newcastle in their group to reach the semi-final.
Ospreys came through the group stage with wins over Harlequins and Worcester to book their place in the last four.
Gloucester: Morgan; Balshaw, Tindall (capt), Allen, Simpson-Daniel; Lamb, R Lawson; Dickinson, Azam, Somerville, W James, Brown, Strokosch, Hazell, Delve.
Replacements: S Lawson, Nieto, Bortolami, Qera, Cooper, Barkley, Watkins.
Ospreys: Henson; Bowe, Parker, Bishop, Williams; Hook, Nutbrown; P James, Hibbard, A Jones, Gough, Lloyd, Smith, Holah, R Jones (capt).
Replacements: Bennett, Griffiths, A-W Jones, Tiatia, Phillips, Biggar, Spratt.
BBC Sport