According to Widespread reports, Romelu Lukaku was set to join the Red Devils after a £75m fee was agreed between the clubs, although conflicting claims suggested the Goodison Park board were yet to sanction the sale.
Lukaku and Pogba, who are both represented by super-agent Mino Raiola, are currently holidaying together in Los Angeles and took part in a training session at the famed sporting university.
Photos of the pair were initially posted on Pogba’s Instagram account on Thursday before being deleted.
Everton welcomed a host of players who served on international duty in June back for their first day of pre-season work on Thursday.
Jose Mourinho’s United squad arrive in California on Sunday to begin their 2017 tour, which features games against LA Galaxy, Real Salt Lake, Manchester City, Real Madrid and Barcelona.