"Good morning from Spartak Zelenogorsk! [Dele] Alli will take part fully in today's training session, but it's believed he is unlikely to start against Panama on Sunday," official team reporter Laure James wrote on her Twitter account.
Alli is recovering from a minor thigh injury, which he sustained during England's 2-1 victory against Tunisia on Monday.
The team currently sits second in Group G behind Belgium, who beat Panama 3-0 in the group's first match, on goal difference.
The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.