"There's zero doubts in my mind I'll be playing in that first game and will be playing at the level I've played," Cruz told reporters Thursday, according to Ralph Vacchiano of the New York Daily News.
"I do feel like I can continue to be the same guy that I was before," he added, according to NFL.com.
Cruz, 28, tore the patellar tendon in his right knee in October. Players who have surgery to repair a torn patellar tendon typically begin running six months into their recovery.
"He can return to 100%, but it (his knee) is a car in a car accident," Dr. David Chao, a former NFL team physician, told the Daily News in October. "Never brand new when fixed."
Cruz was signed as an undrafted free agent from the University of Massachusetts in 2010 and spent his rookie season on injured reserve with a hamstring injury.
Cruz finished third in the NFL with 1,536 receiving yards in 2011 and was selected to the Pro Bowl in 2012 after totaling 1,092 yards. He signed a six-year, $46 million contract extension before the 2013 season.
- Dan Gartland