If someone really wants to leave, it's not a good idea to keep them around - especially if they've been 'tapped up' by another big club.
Laporte's actions in relation to not being picked to play for France summed him up for me. He's a bit of a mard arse with a poor attitude. Not a particularly good professional.
He's not a first choice player imo. He's a solid back up but lacks any real skill or leadership qualities.
If Barcelona do want him, he'll be begging Pep to let him leave. Pep should shake his hand, say thanks and good luck, and let Txiki 'negotiate' a £50m transfer. He won't be missed.