Bartomeu will shortly renew Messi's contract. It's unlikely that the process will be too drawn out because the conditions have already been agreed upon between the player and the club. Messi's salary will increase significantly and will soon be similar to what Ronaldo earns at Real Madrid.
The Portuguese earns €18 million as a basic salary with another three million in variable bonuses. Messi's pay packet will be similar, which is a substantial improvement because he currently earns some €13 million that can increase to €16 million if he hits all his targets.
The new contract was already agreed on between the club's former president, Rosell, and the player's father. The only reason that it hasn't already been signed yet was that the club wanted to make sure Iniesta renewed his contract first.
With that out of the way, sealing Messi's new contract is now a priority and it will undoubtedly happen sooner rather than later. The club doesn't want it to be a drawn out affair, given that the first leg of the Champions League round of 16 against Manchester City is looming large on the horizon.
There is a great deal of interest in renewing contracts around Barcelona at the moment, now that the real figures involved in Neymar's transfer are coming to light. The Brazilian's contract fits the team's pay structure, but if you add all the contracts Barcelona signed with the company owned by the player's father then his earnings top everyone else's apart from Messi's - and they are in the same ballpark as the Argentine's, depending on how you interpret the figures.