Daniel Ricciardo says it is disappointing that Red Bull is not able to close the gap to the front pack after qualifying for the Canadian Grand Prix.
Ricciardo, who took his maiden Formula 1 win at the circuit 12 months ago, will line-up from ninth place on the grid, one position behind team-mate Daniil Kvyat.
"The weekend so far has been tough, we have struggled for most of it," he said.
"This is a power circuit and we are power limited. We have been trying a few options with the tyres but we couldn’t find a solution that worked which is quite frustrating.
"We couldn’t get a happy medium. We don’t seem to be propelling forward at the moment which is disappointing. We’ll do what we can, the team is working hard and we have to keep pushing."
Kvyat added that Red Bull anticipated a challenging weekend.
"It wasn’t an easy qualifying but we got the maximum out of the car we could today," he said.
"We have to keep pushing as we want to be further up the grid; we have a lot of work to do to be as competitive on the straights as our rivals.
"We knew this track wasn’t going to be easy for us, nevertheless, it’s a competitive position we’re starting from and anything can happen in the race as we have seen in the past."