Brentford striker Clayton Donaldson may not have got on the scoresheet in Sunday's FA Cup draw, but his contribution may have been as important as Marcello Trotta's and Harry Forrester's goals.
The 28-year-old, League One's current leading marksman, combined getting forward with dropping into right wing to snuff out the threat of England international full back Ashley Cole, when Brentford were without the ball.
The tactic, coupled with the Bees' counter attacking gameplan, unsettled the European champions in the first half and allowed Trotta to give his side a half-time lead and an edge.
When Donaldson was moved further forward in the second half in the wake of Trotta's withdrawal, he threaded the pass through for Tom Adeyemi to be brought down by Chelsea keeper Ross Turnbull for Forrester's penalty.
"We new we had to turn up and put a show on. It wasn't going to be easy. The game plan was to try and catch them on the break," he said.
"We knew Ashley always like to go forward so I moved there to stop him. He is a threat. He is more of an offensive player than a defender
"It was very tiring because he is always on the front foot and trying to attack.
"It seemed to work. They were looknig for him in the first half and because I was there they had to change their minds and go elsewhere."
And while Donaldson was disappointed the hardwork didn't quite pay off to the tune of a memorable victory, he saw no reason why the Bees could not repeat their heroics at Stamford Bridge on February 17.
"They created two chances, got two goals and that is the standard in the Premier League," he added.
"We could honestly say we were disappointed not to win the game, which shows how far we have come.
"If you look at their results they have been poor at home and better on the road. Hopefully, we can go there and upset them again. Their home form hasn't been the best."
But returning to League One winning ways remains the priority.
"It will be difficult to take the focus off the cup game, but we need focus on the league and get back to winning ways as we haven't won for a while," said Donaldson.
"We have to enjoy this day, but the league is the priority. If we can get back to winning ways then we can go into the replay full of confidence."