Boss claims signing shows long-term ambition...
The Argentine forward, who moved to the DW Stadium on a three-year deal, has struggled to establish himself in the Premier League, both at Stamford Bridge and during a loan spell at Blackburn Rovers last season, but Martinez is delighted to have signed the player on a long-term deal.
"It is exciting because in any loan situation you do not have the bigger picture and the long-term ambition," said Martinez.
"It is not just a matter of getting him up to speed and then losing at the end of a 12-month period.
"It is important that from all the young players we are developing here, we get rewards.
"To have Franco here as a permanent player is a great signing for us, as we can really focus on his development and fulfilling his potential so Wigan can get the rewards."