Super Eagles stars Taiwo Awoniyi and Emmanuel Dennis are not part of the Nottingham Forest pre-season training trip of Spain.
Both players carry Nigerian passports and would need a European entry visa to get into Spain as the UK is no longer in the European Union.
Awoniyi was Forest top scorer for Forest to stay put in the Premier League last season.
Dennis, on the other hand, has yet to establish himself at the club since his arrival from Watford.
Speculations are that he will be allowed to leave the team in this window.
Without the Nigerian stars, Forest fell 1-0 to La Liga side Valencia in a friendly Tuesday.