The Three Lions will play Ronald Koeman’s side in Amsterdam on Friday night, before returning to Wembley to take on Italy on March 27.
But Gomez, Henderson and Oxlade-Chamberlain took part in an energetic session at St George’s Park on Monday, and were joined by Trent Alexander-Arnold the following day.
Alexander-Arnold is currently set to remain with the U21s squad for their clashes with Romania and Ukraine, but his inclusion is a positive sign.
Spirits are clearly high in the England camp, with competition among Southgate’s ranks rife as a host of peripheral figures bid for a place in the squad for the World Cup.
England have been drawn in Group G with Belgium, Tunisia and Panama, and all four of the Liverpool players in this month’s squad can hope to make the plane to Russia.
Henderson is seemingly in contention for the captaincy, vying with Joe Hart, Eric Dier and Harry Kane.
Though he was omitted from the squad for November’s 0-0 draws with Germany and Brazil, Oxlade-Chamberlain is now likely to be part of Southgate’s World Cup selection due to his club form.
Lallana’s lack of game time at Liverpool seems to have done no damage to his hopes, while Gomez is looking to force his way into the senior setup on a regular basis.