Cucho, 21, spent last season with Real Mallorca and is available again after their relegation.
Following Watford's own relegation, the striker is eager to push for another move away - and favours a return to Spain.
AS says Huesca are keen to re-sign Cucho, with the Colombian having spent two of his four seasons away on-loan with the outfit.
At just 18 years old, Cucho arrived in Huesca and was one of the big revelations of that season in the Segunda, thanks to his 16 goals. The striker decided to continue for their Primera campaign, but his debut in that division was not as expected, scoring four goals in 34 games.