The French side are keen on signing the Paraguayan on a loan deal, but need the striker to take a cut in his £80,000-a-week wages.
The 28-year-old joined City in a £17.5million deal from Blackburn just 12 months ago, but the club are now keen to sell the striker.
City are looking to reduce their squad size and sold defender Javier Garrido to Lazio earlier this week.
