"We're here to be ambassadors for the NFL and the players understand that," Brady told
BBC London 94.9.
"But we realise our main goal is to win a football game. It will certainly be a much longer flight home if we don't take care of business."
NFL at Wembley past results
Chicago Bears 24-18 Tampa Bay Buccaneers
San Francisco 49ers 24-16 Denver Broncos
New England Patriots 35-7 Tampa Bay Buccaneers
New Orleans Saints 37-32 San Diego Chargers
New York Giants 13-10 Miami Dolphins
The 35-year-old added: "I hope the event continues to grow and that's why we're here.
"The most important thing is using the next days to prepare and not get distracted by all the things you could possibly go out and do.
"It's not a vacation or a sight-seeing tour."
The Patriots, who made the Super Bowl in February, have started the season with four wins and three defeats.
"We're still growing as a team," Brady said.
"We're not even at the halfway point. Each step along the way, we've learnt and hopefully this weekend is the best game of the season.
"Our goals are still ahead of us and this will be a very important win for us, if we can get it, going into bye week next week.
"You look at this game as a very critical point and critical game in our season where if we can just get to 5-3, we feel like we're at a decent point where we've learned a lot form the last eight games."
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