Sportsmail understands the Football Association have requested Abraham’s medical records for Chelsea – a clear indication that he is under serious consideration for October’s Euro 2020 qualifiers against Czech Republic and Bulgaria.
Southgate announces his squad on Thursday, with Abraham hopeful his excellent start to the season will be enough for him to land a recall.
Nigeria have tried to convince Abraham, who has two friendly caps for England, to switch his international allegiance.
As of yet, the striker, who is 22 on Wednesday, is yet to publicly clarify which country he wants to play for.
But it is understood Abraham, who qualifies for Nigeria through his father, will answer England’s call if he is picked by Southgate this week.
Abraham would be not be able to switch to Nigeria if he features for England in the forthcoming games against the Czech Republic and Bulgaria because they are competitive fixtures.
The Blues striker has netted seven goals in the Premier League this season, which makes him the highest scoring Englishman in the top flight.
Southgate revealed following England’s recent win over Kosovo that Abraham was firmly on his radar.
There are doubts over the form of Jesse Lingard and Dele Alli should Southgate decide to make space for an extra striker by dropping a midfielder.
Nigeria are also interested in poaching Abraham’s club team-mate Fikayo Tomori, who has represented England and Canada at youth level.