A lack of pace on Friday in Azerbaijan set the tone for Mercedes' most recent weekend with neither driver setting a top 10 worthy time.
"Not fast enough, we've made mistakes, we struggle to switch the tyres on and we've been on the back-foot through free practice," assessed Shovlin.
"We know the level it takes to win championships and we're not at that level right now so we need to re-group and come back performing the way we know that we can.
"We have the team, the car and the drivers to win this but we need to be tough and honest with ourselves over the next few days. We've had days like this before and each time we've come back strong and we'll look do that in France."
Mercedes form "extremely disappointing"
Although Lewis Hamilton had recovered well in qualifying, setting the second-fastest time, a late-race error dropped him to the back of the field.
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