Barcelona expect David Luiz to tell Chelsea on Monday that he wants to join the Spanish champions.
Barca had an opening bid for the Brazilian rejected on Wednesday with Mourinho warning them not to return with another bid.
However, Barcelona are convinced Mourinho is merely driving up the price and hope Luiz's desire to join them can help sway negotiations.

Waiting game: Barca expect Luiz to hand in a transfer request in the coming days to force a move
Liverpool's Daniel Agger remains their back-up plan, but has just been announced as the new vice-captain at Anfield, replacing Jamie Carragher.
This week, Mourinho told Barca boss Tata Martino in no uncertain terms to turn his attentions elsewhere.
'The bid? It's lost time for them,' said Mourinho.
'My advice to them is to go to the second player on their list because they are wasting their time. We don't want to lose our best players. No chance.'

Case for the defence: Barca boss Martino could turn to Liverpool's Agger if his Luiz bid falters
Barca had an opening bid for the Brazilian rejected on Wednesday with Mourinho warning them not to return with another bid.
However, Barcelona are convinced Mourinho is merely driving up the price and hope Luiz's desire to join them can help sway negotiations.
Waiting game: Barca expect Luiz to hand in a transfer request in the coming days to force a move
This week, Mourinho told Barca boss Tata Martino in no uncertain terms to turn his attentions elsewhere.
'The bid? It's lost time for them,' said Mourinho.
'My advice to them is to go to the second player on their list because they are wasting their time. We don't want to lose our best players. No chance.'
Case for the defence: Barca boss Martino could turn to Liverpool's Agger if his Luiz bid falters