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Javier Zanetti is a stalwart for Inter in the midfield. However, he's 39 years old. Inter must find his eventual replacement. It's highly unlikely he'll be able to continue at this level at his age for long.
As a result, they have to find a strong midfielder to replace him. Maybe a few of them.
There's a real shortage of talent in the midfield for the Nerazzurri. There's a real shortage of youth, too. Both must be rectified this summer for Inter.
Walter Gargano is younger, relatively speaking, but he hasn't been a consistent presence in Inter's midfield. He's in the prime of his career and that usually means there's not a lot of room for improvement. Giving him a year or two more to develop is a waste of time—it's time to get younger and better.
Inter could do this by emphasizing youth development and/or making a push to sign young stars who are hitting their prime. If they don't take this issue seriously, this Italian giant will continue to find itself barely contending for a spot in European competition.