Leeds are only six points clear of the drop zone and are big as 12-1 to return back home to Yorkshire with all three points.
Thomas Tuchel's third-placed Blues have lost just twice all season and are only two points off top spot but Forshaw says there are steps that United can take in search of causing a shock.
“Us as a unit, we have to make sure we defend well, first and foremost," Forshaw told LUTV.
“Going to places like Chelsea, I think you have to be disciplined.
"You have to ride moments, definitely, as they have brilliant individual players.
“We have to remain focused as much as we can and use the pace that we have on the break, to try and surprise them ourselves.
“When you got to places like this, you have to be compact without the ball and hard to beat.
"But, then try and expand when you do have it.
“Retain the ball as well as you can and go from there, try and frustrate them, too.”
Reflecting on his own condition after a seamless return to the side following his long lay off with a hip issue, Forshaw said: "I feel really good.
“I’m recovering well from games now, so I am just looking forward to the next one this weekend at Chelsea, to keep building and helping the team as much as I can.
“I am getting fitter and fitter as the games go on. Once I proved it to myself when I did the 90 minutes against Leicester, that was it.
“The little bit of cramp in that game in the calves, I haven’t had since. I am just feeling more confident and comfortable as the games go on, so hopefully long may that continue.
“It was tough times for me in the last years, I won’t lie, but now I am like a kid again."
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Thank you Laura Collins