The Hornets' Championship tie with Swansea on Saturday was postponed due to a frozen pitch, but they now have their undersoil heating fixed and have placed covers on the most vulnerable places on the field.
A statement released on www.watfordfc.co.uk reads:
'The club's under-soil heating boiler is now working following a visit from contractors today (Monday).
The heating will be left on overnight in order to prepare the pitch for the game, however the low temperatures mean the system takes longer to become fully operational.
With this in mind the club is placing covers on the southern third on the pitch, this is the area that is not exposed to the sun.
A decision will then be made tomorrow (Tuesday) morning as to whether an external heater will be required.'
United's original pencilled fixture with the Hertfordshire outfit was called off because of icy conditions.