The Hornets are trying to bring Danny Graham back to the club and are also keen to sign Stevenage winger Luke Freeman, the Watford Observer understands.
Watford have made enquiries for the two players but negotiations are at a very early stage with both.
We understand Graham would welcome a move back to Watford.
The Golden Boys have already signed three players this summer. The arrivals of Tottenham Hotspur goalkeeper Heurelho Gomes and former West Bromwich Albion centre back Gabriel Tamas on free transfers have been confirmed by the club in the last week and Leicester City's Lloyd Dyer has signed a contract with the Hornets, although that has yet to be announced.
Watford are still in talks with Daniel Tozser over a permanent move and are keen to re-sign Matej Vydra, both as previously reported by the Watford Observer.
But the club also want to add British players to the squad and we understand two of those are Graham and Freeman.
Graham was a fans' favourite during his two seasons at Watford. He scored 41 goals in 98 games and was Player of the Season in his second year.
He finished top scorer in the Championship during the 2010/11 campaign, with 27 goals, and his form earned a £3.5m move to Swansea City.
Graham scored 21 goals in 62 appearances during a season-and-a-half at the Welsh club, with 15 of those being substitute outings.
He then joined Sunderland for £5m in January last year, which earned Watford another £225,000, but failed to score in 13 games for the club and spent last season out on loan.
Graham scored once in 20 outings at Hull City in the Premier League before a more successive spell at Middlesbrough in the Championship, when he netted six times in 18 appearances.
Like Graham, Stevenage's Freeman is expected to leave his club this summer.
Stevenage activated a clause in the 22-year-old's contract in May which means he is contracted for an additional year but manager Graham Westley has publicly stated he expects the winger to leave after the club were relegated to League Two.
Freeman was The Boro's player of the season and Stevenage received bids from Championship clubs in January.
He made his professional debut in 2007 at the age of 15 and had three run-outs for Gillingham before Arsenal paid £200,000 to secure the teenager's services a few months later.
Freeman was unable to break into the Arsenal first team and a loan spell at Yeovil Town in 2010 was ended prematurely due to injury.
The former England youth international's career got back on track when he joined Stevenage in 2011, initially on loan before the move was made permanent two months later.
Freeman is a winger with flair and creativity but also works hard without the ball. He scored eight goals in 54 appearances for the club this season, a few of which were at full back.
Last month Westley told The Comet: "I suspect the football club will cash in and I’m sure there’ll be a bidding war.
"I know there were clubs in for him in January putting bids on the table, I’m sure this summer that’ll reach a head.
"I can’t imagine that somebody isn’t going to look back at some of what he’s done this year and think he’s worth a punt at a higher level."