Real Sociedad have reportedly offered Juanmi a swift return to La Liga.
The 22-year-old joined Southampton 12 months ago from Malaga in a deal thought to be worth around £5m.
However, the striker has so far struggled to produce the goods on the south coast, with no goals from his 13 appearances in all competitions.
According to El Diario Vasco, Juanmi has now agreed terms with Sociedad following a number of discussions.
Now, the Basque club must agree a fee with the Saints, who are said to want £3m.