Washington Redskins quarterback Robert Griffin III is confident that his side have amended their pre-season struggles ahead of the start of the 2014 campaign.

Griffin and his offense failed to click in their four matches in the pre-season, leading to concerns about their form heading into the regular season.

However, despite those fears the 24-year-old is adamant that his side will come out firing on Sunday.

"We fixed what we had to fix in practice," Griffin told reporters. "That's for us to know and you guys to find out."

The Redskins face the Houston Texans in their season opener on Sunday.