After the Irishman netted again in the Tigers' 2-0 win over West Brom on Saturday, the manager feels that the January signings' deadlier finishing has provided an edge
The two strikers have scored three goals apiece since arriving from Everton and West Brom, respectively, and the Irishman was on target against his former club on Saturday as the Tigers pulled eight points clear of the relegation zone with a 2-0 home win.
There could have been a goal for Jelavic earlier in the game but the Croatian missed a penalty, which had been won by Long, and was grateful to see Liam Rosenior spare his blushes by following up to open the scoring.
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"They've both made a difference to us because we didn't play well [against West Brom] but we've got a bit of quality up the top end of the pitch to get you something.
"With those two up front, when you don't play well they can maybe create something for you and they're always going to be a handful with the attitude both of them have got."
Although Bruce accepts that Hull were far from their best on Saturday, he is pleased with the determination that they showed in grinding out a result.
"We didn't play well but there was a resilience and an attitude that, once we got the break and got the goal, we'd see it through," he observed. "That was pretty evident for everybody to see.
"At the moment we're doing okay and I hope that continues."