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Gonalons has stayed with Lyon despite rumors of a Napoli move.
The Lyon captain was consistently mentioned in the transfer rumor mill this winter, but as reported by several media outlets—including ESPNFC's Ian Holyman—team president Jean-Michel Aulas rejected several approaches from Serie A contender Napoli to keep the midfielder with the team.
WhoScored.com rates Gonalons as Lyon's third-best player in Europa League play this year. He has started six times and scored once in group play. He skipped the round of 32 tie against Odessa but played both games against Viktoria Plzen, providing a few dangerous key passes in the first leg.
The leader in the OL locker room, Gonalons will be tasked with helping contain Juve's magnificent midfield. It will be his job to not only stop attacking midfielders Marchisio and Paul Pogba—and Vidal when he reappears in the second leg—but to try to trigger Lyon's own attack when he can relieve the pressure that will undoubtedly come.
The 21-year-old Zeffane, who last played against Odessa in February, could be a key in OL's defence in this tie. Likely the leading candidate to replace first-choice right-back Miguel Lopes, who broke his leg against Guingamp at the weekend, Zeffane—if chosen—will be given with the daunting task of facing down Kwadwo Asamoah on Juve's left. The Ghanaian has been in the form of his life over the last two months, and if Zeffane can't keep him in check life could be made very difficult for Lyon.
He has acquitted himself well in the few games he's played this year—WhoScored averages put him at 3.5 tackles and 1.5 interceptions per game in the league this year—but he is about to take a step into the big leagues if he plays in the next two weeks. How he will respond could determine whether Lyon moves on in the competition.
Lyon's top scorer this season with 15 goals in all competitions, how Lacazette fairs against the likes of Leonardo Bonucci and Giorgio Chiellini will be critical.
Juve have conceded just one goal in their four Europa League matches this year, but they haven't played against forwards quite on Lacazette's level. Trabzonspor's forwards aren't near as good, and while Fiorentina does have Mario Gomez, he wasn't yet at full form after a long injury layoff.
It will be up to Lacazette to pierce through the back three—a unit composed of three international starters for two countries—and find a way to beat Buffon. If Juve can shut him down and force his teammates to find goals, OL's side of the aggregate could be very lean indeed.