Stevens tested positive for cocaine following Bath's Heineken Cup game against Glasgow in December 2008.
Irish host Toulon in the Heineken Cup this Sunday, having lost their last three Premiership matches.
Young's team began the season in the Heineken Cup, but failed to make the quarter-finals.
The third, fourth and fifth-ranked Heineken Cup group runners-up will play in the Challenge Cup quarter-finals.
The player is not registered for Saracens' pre-Christmas Heineken Cup games against French side Racing Metro.
But they lost to Leicester in a historic Heineken Cup semi-final penalty shoot-out in 2009.
We'd love to be winning the Heineken Cup, but this certainly is the next best thing.
Trimble picked up the injury during Ulster's Heineken Cup win over Aironi on Saturday.
Having lost heavily to Gloucester at Ravenhill, Ulster's Heineken Cup hopes look over after two games.
They then travel to face Heineken Cup rivals Munster at Thomond Park on Saturday, 18 September.
The Scarlets become the 24th and final side to make next season's Heineken Cup.
The current Heineken Cup contract, called the "Paris Accord", runs out in July 2007.
But the Blues held on to also send the Scarlets into next year's Heineken Cup.
The blind-side suffered medial knee ligament damage in Leicester's Heineken Cup win over Viadana on Saturday.
Munster are keen to have Carney for the knock-out stages of the Heineken Cup.
Replacement Richard Wigglesworth scored late on to secure Sale's place in next season's Heineken Cup.
"I'm very hopeful that I will be ready for the start of the Heineken Cup".
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Swansea suffered a lacklustre Welsh-Scottish League campaign last year and struggled in the Heineken Cup.
As a player, he won three Guinness Premiership winners medals as well the Heineken Cup in 2004.
Edinburgh has sold more than 30, 000 tickets for its clash with Toulouse, the four-times Heineken Cup champion.
The flanker is in his first year with Heineken Cup quarter-finalists Northampton after three seasons at Worcester.
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"At Christmas we were battling to qualify for the Heineken Cup in the Magners League, " he said.
Blues colleague Xavier Rush was also red-carded in Sunday's 23-19 loss that ended Cardiff's Heineken Cup hopes.
But Munster were never threatened as they marched into their seventh Heineken Cup semi-final in nine years.
The new Celtic League table would also lend itself to Heineken Cup qualification for all four countries.
The Ospreys full-back, 29, limped off during his side's 32-32 Heineken Cup draw with Leicester on Sunday.
Bath take on Italian side Aironi on Saturday, all but mathematically ruled out of the Heineken Cup.
Paterson also watched Caucau in action for Agen against his club Edinburgh in this season's Heineken Cup.
Jones, 31, damaged an elbow in the Ospreys' 24-12 Heineken Cup defeat by London Irish on Sunday.
Toulouse levelled through Yves Donguy's try but a third penalty from O'Gara clinched Munster's second Heineken Cup.
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