Heineken Cup, Amlin Challenge Cup, Guinness Premiership: team news

Heineken Cup Quarter-finals Biarritz v Ospreys Tomorrow, 3pm, Estadio Anoeta, San Sebastian, Sky Sports 2 Biarritz are talking up Shane Williams, but they have a flyer of their own in Takudzwa Ngwenya. The Zimbabwe-born US wing who sank Gloucester with a 14-minute hat-trick in October is inspiring Biarritz side as they attempt to stay at Europe's top table – either by dragging themselves up the Top 14 or by winning the Heineken Cup. Munster v Northampton Tomorrow, 5.30pm, Thomond Park, Sky Sports 2 With Shane Geraghty at fly-half in January, Saints lost a game in Limerick they could have won. So Stephen Myler starts this time. Courtney Lawes is in the second row with Juandre Kruger. Munster are aiming to reach the semi-finals for the ninth time. Amlin Challenge Cup Quarter-finals Connacht v Bourgoin Tomorrow, 1pm, Sports Ground, Galway Last season Bourgoin beat London Irish and Worcester before losing the final to Northampton. A team including the France fly-half Benjamin Boyet, prop Olivier Milloud and wing Jean-François Coux and the Kiwi lock Bryce Williams is a strong one. Connacht's captain, John Muldoon, returns to the back row. Toulon v Scarlets Tomorrow, 8pm, Stade Félix Mayol Jonny Wilkinson, Sonny Bill Williams and Tom May may make up the Toulon midfield but the captain, Joe van Niekerk, is on the bench with the former France No9 Pierre Mignoni. The Scarlets are without their Lions hooker, Matthew Rees, who injured his neck in training. Guinness Premiership Harlequins v Leeds Tomorrow, 2pm, The Twickenham Stoop Leeds have found a bit of away form – three wins from five in the Premiership – but Harlequins are no pushovers at home and they have England'sNo8, Nick Easter, back for the first time since the Six Nations. Ugo Monye and Gonzalo Tiesi, who are injured, are replaced by David Strettle and George Lowe. Worcester v London Irish Tomorrow, 3pm, Sixways Worcester will play the rest of the season without the wing Miles Benjamin and prop Matt Mullan. Mike Ruddock has made four changes after losing at Sale last week. The wing Marcel Garvey, centre Alex Grove, hooker Aleki Lutui and lock Graham Kitchener start. Irish have Chris Malone at fly-half and the prop Alex Corbisiero makes his first start of 2010. Heineken Cup Quarter-final Toulouse v Stade Français Sunday, 4.30pm, Stade Municipal, Sky Sports 2 Stade's season could end here. They are ninth in the Top 14, the French federation wants to look at the books and Toulouse are so strong that the France back Maxime Médard can't find a starting spot. Watch for Florian Fritz v Mathieu Bastareaud in the centres. Amlin Cup Quarter-finals Newcastle v Cardiff Blues Sunday, 3pm, Kingston Park, S4C Newcastle have the scrum-half Micky Young back and the full-back Alex Tait also returns. The Blues are without Tom Shanklin, Gareth Cooper and Andy Powell but field nine players who saw Six Nations action. Newcastle's Carl Hayman faces Gethin Jenkins in a captains' front-row head to head. Wasps v Gloucester Sunday, 2pm, Adams Park Gloucester have Mike Tindall back to lead a side which mixes solid experience with youthful enthusiasm. Wasps have Simon Shaw on the bench as Dan Ward-Smith continues at lock, alongside George Skivington.