The Blues head into the game looking to build on their recent improved run of form under interim boss Guus Hiddink.
Chelsea were 1-0 winners at Arsenal last month and booked their place in the fifth round of the FA Cup with a convincing 5-1 win at MK Dons on Sunday afternoon.
The west London side will be keen to improve their form in the top flight this season after their disastrous start to the campaign left them in 13th place heading into the final 15 games of the season.
And former Liverpool man Lawrenson is expecting a straightforward affair for the Blues when they travel to Vicarage Road on Wednesday night.
Lawrenson told BBC Sport‘s website: “Chelsea drew with Watford in Guus Hiddink’s first game in charge but the Blues look like a different team now.
“Players like Eden Hazard have come back into form and seem to have the spring back in their step – I can see them going on a really good run and John Terry is bound to be a part of that.
“Following his announcement that he is going to leave Chelsea in the summer, and with the uncertainty over whether he might actually stay, you just know that he is going to be very impressive from now until the end of the season.”
Chelsea will host Manchester City in the fifth round of the FA Cup later this month.
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