Christian Horner says he expects the races in Belgium and Italy to be "much more challenging" for Red Bull Racing.

Red Bull Racing went into the summer break boosted by their best performance of the season in Hungary, with Daniil Kvyat and Daniel Ricciardo finishing second and third.

However, with Belgium and Italy both more power circuits and with engine supplier Renault still behind Mercedes and Ferrari, the next events will be far from easy for the Milton Keynes squad, although rain at Spa could aid their cause.

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"They're going to be much more challenging than Hungary and Singapore is probably our next opportunity to shine," Horner replied, when quizzed on the next two events on the 2015 F1 schedule.

"We're going to keep pushing, keep developing with the car though. You never know, it could be wet in Spa.

"You've got to be in a position on those days when it doesn't go right for others."

Horner also confirmed that more engine penalties are "inevitable" in the coming races: "I think inevitably we're going to take another engine, especially with Ricciardo. Engine five is all he's got until Fridays, Saturdays and Sundays now," he explained.

"Probably in the next couple of races we're going to have to take another unit. Whether that's with one driver or both, we'll have to have a look at the numbers."

Meanwhile, Horner reckons the move to introduce greater driver input at the start of races, something that comes into force at Spa, will potentially mix things up.

"That throws up some different scenarios," he added.