The former Brazil international turns 38 in February and his current deal with the Hornets is due to expire in the summer although he previously indicated he planned to play on for a further season.
However, after falling down the pecking order following Ben Foster's arrival at Vicarage Road during the summer, Gomes has gone on to make only two appearances for Watford this term, both of which came in the Carabao Cup, and he has now indicated he expects to retire at the end of the campaign.
Speaking to Brazilian journalist Jaeci Carvalho, Gomes said: 'I don't know. My contract here with Watford ends in the middle of next year. We did not talk about renewal. But in my head it's already the last year. It's not two years, no.'
Gomes has said a desire to spend more time with his family is one of the driving forces behind his retirement plan.
'Because I want to,' he said when asked about his decision. 'I want to live with my family, I want to live a little longer for God, I think I'll serve him in some area.'
The former Tottenham star has been a loyal servant to Watford - he originally joined them when they were in the Championship - and he has gone on to make close to 150 appearances for the club.