Leinster coach Matt O'Connor says they need to improve in the set piece and must control the ball better in next week’s return clash with Harlequins at the Aviva.
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The Blues lost 24-18 at the Twickenham Stoop having conceded two tries.
Munster will also look to bounce back this coming weekend, after they too tasted defeat on Saturday.
Anthony Foley's side lost 16-9 to Clermont Auvergne at Thomond Park, and now face the daunting task of a return meeting in France.
They're on nine points in the table, one behind Clermont and level with Saracens.

