Harlequins director of rugby Conor O'Shea warned his side's job was onlyhalf done after a famous win over Leinster on Sunday.
Second half tries from man of the match Nick Easter and Asaeli Tikoirotuma secured their side a 24-18 win over the Irishmen at the Stoop to remain unbeaten in the Champions Cup.
O'Shea's men lead Pool Two with 12 points, three ahead of Sunday's defeated visitors and four points clear of English rivals Wasps.
They head to Leinster for the return fixture next week knowing there remains work to be done to reach the knock-out stages of the competition.
"We've not hit our straps, but it's only half-time in Europe," said O'Shea.
"It's a great start, we know what's coming next week [at Leinster]. They're a great side, so I'm really proud."
The win came at a cost with both fly half Nick Evans and prop Joe Marler being forced off through injury.
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