The 31-year-old has been without a club since leaving Charlton last summer after a brief stint with the Addicks.
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Wickham has joined the Hornets’ youth setup to regain fitness while mentoring younger players.
Although not expected to receive a contract, he has impressed by scoring four goals in two games for Watford’s U21s.
His standout performance included a 30-minute hat-trick in a 3-0 win over Colchester.
Wickham, who debuted for Ipswich at just 16, continues to showcase his goalscoring ability.