A 30-player group flew into Birmingham on Monday and held an early evening session in the Midlands, with Fermín López continuing his injury rehab.
The midfielder missed Spain’s World Cup triumph after fracturing his foot against Real Betis in May.
Hansi Flick has combined established first-teamers with players from Barcelona B and the U19s, including forward Orian Goren, who only turned 17 in March.
Frenkie de Jong has also traveled despite a knee issue that was expected to rule him out for months. The 29-year-old sustained damage to the medial collateral ligament in his right knee during the World Cup.
Marc-André ter Stegen is another unexpected inclusion. Though a loan to Ajax has been anticipated, no agreement has been reached, so the German goalkeeper is in England and could face Birmingham on Friday.
Barça trained twice on Tuesday and are using the pitch typically reserved for England’s senior team.
After visiting St Andrew’s, Barça will play Preston behind closed doors at St George’s Park next Monday.
Paul Heckingbottom’s side kicked off pre-season with a 4-1 win over Northern Premier League Premier Division outfit Bamber Bridge earlier this month.
Barça then travel to Italy for two 45-minute games against Nottingham Forest and Udinese in the Friuli Venezia Giulia tournament on 8 August.
Barcelona squad: Ter Stegen, Fort, Balde, Araujo, Cortes, Guille Fernandez, Toni Fernandez, Farinas, Abdelkarim, Tommy, Xavi Espart, Yaakobishvili, Adeyemi, Christensen, Fermin, M Casado, Gerard Martin, Roony, Tunkara, Torrents, Bernal, Gonzalez, Kluivert, Szczesny, Goren, Gistau, Diarra, Pesquer, Rodriguez, De Jong.