Marussia team boss John Booth admitted he was disappointed not to get more from the Belgian Grand Prix after Jules Bianchi and Max Chilton were unable to build on their strong qualifying performance at Spa.

Both drivers made it through to Q2 in challenging weather conditions in the Ardennes but were quickly shuffled back down the pack when the race got underway.

From there, Bianchi took the flag in 18th place with Chilton one spot further back as the final two classified finishers, with Booth admitting that the team had to regroup and focus on Monza after a challenging race day.

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"A tough race today, coming on the back of such a positive day yesterday," he reflected. "Both drivers really suffered at the start of the race, losing position much more quickly than we expected on the opening laps. From this point in the race it was really all about trying to claim back positions but unfortunately we simply didn't have the pace to do that.

"In terms of the decisions made through the race and the operation of the pit crew, there were no issues today at a race where we have brought developments in these areas. Overall we simply need to go back and regroup and attempt to extract as much performance out of the current package as possible before the next race in Monza."

Bianchi's race wasn't helped by a radio issue that made it difficult for him to communicate with the team in the pits and he admitted that the weather conditions had worked against the Anglo-Russian squad.

"It was a tough race today, made more difficult by the fact that I had a radio problem from the start," he said. "Our pace was not as good as we hoped for, which was a shame. Although it was going to be hard to hang on to our grid positions if it didn't rain, we were looking for something more after a good result yesterday.

"As it remained dry we were not presented with the sort of opportunities we were hoping might come our way. However, we did get a two-car finish and also we continue to hold position in the championship, so we will now look to Monza for more of an improvement we hope."