Zambian striker Evans Kangwa has been unable to join Watford for a trial due to a delay in issuing his visa.
The 18-year-old, who is currently in an off-season break with his club Nkana, has been in line for a trial with the Hornets for a couple of months.
Nkana chairman John Chiwele told MTNFootball.com: "He is still earmarked to go for trials at Watford.
"But we have been waiting for his visa to be sorted out which is taking a while to be issued."
Kangwa, who was top scorer in the Zambian top flight last season, confirmed Watford are one of the club's interested in him last month.
He plays for Zambian side Nkana and was the golden boot winner at the COSAFA Under-20 Championship in Botswana in 2011.
"It feels good to be invited by a big club like Watford to attend trials. It’s an honour for me," Kangwa told the Lusaka Times last month.
"I am just waiting for travelling documents. I will be travelling next month," he added.
Kangwa has reportedly interested South African club Orlando Pirates and Dutch side Feyenoord in the past.