Bruno Onmaichi will join Portuguese club Boavista on a permanent transfer at the end of the season.
Onyemaechi was linked to the Panthers from CD Feirense on loan prior to the start of the campaign.
According to reports from Portugal, Boavista will pay €800,000 to secure him a permanent deal next summer.
The 23-year-old impressed in his first campaign in the Spanish Premier League.
Onimaichi has so far played 10 league matches with Boavista.
The multi-skilled player has played at left back, left back and central defense for Boavista this season.
He is in Nigeria’s squad for a friendly match against Portugal.
Transfer: New Super Eagles player Onimaichi prepares for permanent transfer to Boavista