The Uruguayan striker was focused, whilst Neymar was playing the joker and Messi was all smiles.
With their 3-0 advantage from the first-leg at the Camp Nou, the Catalan giants are clear favourites to reach the Berlin final, but the Bavarian outfit managed by Pep Guardiola, are still hopeful of achieving another monumental comeback in the competition.
Ahead of the customary preview press conferences on Monday night, the Barcelona squad trained on the Allianz Arena pitch, getting to grips with the playing surface, as they made their final preparations for Tuesday night's game.
Luis Enrique and the coaching staff put the team through their paces, in what was quite a relaxed training session for the players.
Indeed, sufficiently relaxed for Brazilian star Neymar to decide he could play the prankster, although his attempts at winding up Luis Suarez, weren't so well received at first, if the images are anything to go by.
Trying to put the Uruguayan off, whilst he was deeply focused in his training, Neymar pulled his tongue, pushing and pulling at Suarez.
This didn't sit well with Suarez, who appeared to give Neymar a stern telling off, much to the surprise of the Brazilian, given his facial expression.
The other component of the record breaking 'MSN' trio, did see the funny side, however, laughing at the pair, who eventually broke into smiles themselves.
Such occurrences when captured on camera, which are little more than a bit of banter between team-mates, have often been misinterpreted by the Spanish press, who have sometimes jumped to the conclusion there might be friction.
The truth is quite the opposite though, with the trio of players maintaining a great relationship, off the pitch and on it, as their remarkable numbers will testify this season.