Lionel Messi and Luis Suarez inseparable during Barcelona training as Spanish side continue St George's Park pre-season camp

Lionel Messi and Luis Suarez were almost inseparable during Barcelona training at St George's Park on Tuesday morning.

The attacking pair - without third prong Neymar, who is at the Olympics with Brazil - are spending a second day at England's HQ.

Luis Enrique's side face Celtic in Dublin this weekend and have set up camp in Burton-on-Trent for a number of partially open sessions.

BARCA'S SQUAD IN ENGLAND 

Masip, Turan, Suarez, Messi, Munir, Sergi Roberto, Aleix Vidal, Mathieu, Denis, Montoya, Tello, Samper, Jose Suarez, Josep Martinez, Marlon, Martinez, Borja Lopez, Carbonell, Gumbau, Alena, Nili, Alfaro, Camara and Mujica.

Messi and Suarez were seen wandering out to warm up together, breaking clear of the group during light running drills.

The 23-strong squad, including plenty of youngsters, then split into rondos as Enrique looks to address a lack of early pre-season sharpness.

Barcelona arrived in the UK on Monday, making the short trip from Birmingham Airport before a short training exercise.

The game against Celtic at the Aviva Stadium on Saturday evening kicks off their International Champions Cup campaign before they head off to Stockholm.

There Barca will play Premier League champions Leicester City on August 3 and Liverpool at Wembley three days later.

Enrique is hopeful of adding more stars to his squad in the coming weeks after securing Andre Gomes from Valencia for £41.7million.

The Portugal international, who had been a target for bitter rivals Real Madrid, will be presented in Barcelona on Wednesday.

Gomes will undergo medical testing at the club's training ground on Tuesday before being officially unveiled the next day.

Barca have also been linked with moves for strikers Luciano Vietto from Atletico Madrid and AC Milan's Colombian Carlos Bacca.

Bacca is reported to have grown frustrated at a lack of Champions League football at the San Siro.

'Bacca is a player of an international standard,' said AC Milan boss Vincenzo Montella.

'It's hard to give up a player who guarantees goals. The club will evaluate things with the boy, because he aspires to play in the Champions League.'