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Carlos Gonzalez will likely miss the rest of the season due to his ongoing struggles with a nagging knee injury. According to Patrick Saunders of the Denver Post:
Gonzalez, 28, has suffered from left knee tendinitis since last season, and it's bothered him acutely at times this season. He was placed on the 15-day disabled list Sunday.
According to Dugger, the Rockies are exploring a number of treatment options, including surgery or treatments such as plasma-rich platelets or stem-cell therapy.
The only way CarGo will play again this season is if it's decided that rest and rehab will allow him back on the field. That is an unlikely scenario.
Between injuries, misfires, miscalculations, and playing in what is one of the strongest divisions in baseball, Colorado has been on the rocks for the better part of this year, and keeping Gonzalez off the field regardless of his fitness level may be the best thing for all parties. He's hitting just .238/.292/.431 on the season, well below his career triple slash of .294/.351/.520. He has been sixteen percent below average as a hitter, with just an 84 wRC+, which is 37 points below his career wRC+ of 121.
One way or another, Colorado will rely on Gonzalez and Tulowitzki to drive their offense, and if they can both come back healthy and strong in 2015, the Rockies might have something. Between Gonzalez, Tulowitzki, Blackmon, Arenado, and Morneau, and the return of other injured players like Michael Cuddyer, the Rockies could have one of the National League's best offenses.
They just need to get healthy first, and stay healthy once they are there.