McCaw, in a bid to preserve his body for the ultimately successful 2015 World Cup defence, missed most of Super Rugby in 2013 and the June series with France.
"We've proven over a long period of time now that we'll sit down with each player and, within reason, be incredibly flexible," Tew said on Monday.
"If that's what any player wanted and we believed it merited in terms of their tenure and loyalty, and their workload, we'd consider that."
Irrespective of any sabbatical, Read will be forced to take a prolonged break from rugby after having his wrist operated on two weeks ago.
Crusaders boss Scott Robertson confirmed on Monday that his No.8 would sit out Super Rugby action until April, just two months before the Lions tour.
As a result Robertson has elected to install Test lock Sam Whitelock as his side's 2017 skipper, giving Read the chance to recuperate and rejuvenate.
The 83-cap Whitelock had previously captained the Crusaders during Read's absence at the start of 2016.
"Kieran has been an excellent captain, he's a courageous leader who the players admire and love," Robertson said.
"This will allow Kieran to focus on just playing and enjoying himself in the Crusaders' environment."
Meanwhile, Tew confirmed final contract offers had been extended to All Blacks stalwarts Aaron Cruden, Israel Dagg and Ben Smith.
All three will be off-contract next year and have reportedly fielded lucrative deals from clubs in Ireland and France.
Head coach Steve Hansen has publicly called on the trio to stay until 2019 and write another chapter in their Test stories.
"They all know we love them to death and we'd love them to stay, but they've got to make their decision," Tew said.
"We continue to work really hard to create great environments for our players."
