Ongoing groin issues stemming from surgery in November last year troubled the Eagles' star ruckman throughout last season.
The 2012 All Australian missed the first five matches and managed just 11 games before prematurely ending his season after round 17.
West Coast football operations manager Craig Vozzo says Naitanui's return to full training will continue to be a slow process, to ensure he has no long-term problems.
"He's gradually building up. Again there's no rush with Nic," Vozzo told AFL.com.au.
"Let's try to get it right for the long-term, is the approach, and slowly but surely we are getting there.
"It can be frustrating at times for any player, not just Nic, spending extended periods in a rehab program.
"But Nic is handling it pretty well, we think, and we're keen to keep that graduated improvement going and we're confident we will."
The 2014 season looms as an important one for both Naitanui and the Eagles. The 23-year-old is out of contract at the end of 2014 and given his star power, there is already some speculation his next contract could yield in excess of $1 million a season.
The Eagles announced on Friday that Josh Kennedy, Jack Darling and 2013 best and fairest Matt Priddis had all signed contract extensions although there were no specific details provided.