Fitz Hall has reportedly completed a medical with Watford ahead of his proposed switch to Vicarage Road.
The 31-year-old is currently a free agent following his release from Premier League side Queens Park Rangers at the end of last season.
Having held positive discussions with Watford boss Gianfranco Zola, the versatile defender will sign a contract with the Hornets tomorrow, according to Sky Sports News.
Hall will act as a direct replacement for Adrian Mariappa, who joined Reading earlier today.