Murray has won three Grand Slams so far in his career, two at Wimbledon and a US Open back in 2012.
He enjoyed his best season to date in 2016, as he won another Olympic Gold medal and ended the year as world number one. The Scot had to beat Novak Djokovic at the ATP World Tour Finals but he proved his class with a straight sets victory.
Murray has yet to win the French Open or Australian Open but Rusedski believes he could win at least two in 2017.
"This year was a rarity that the player who finished No. 1 didn't have the most majors," Rusedski told PA Sport.
"Next year the goal's got to be to try to win at least two majors because usually the best player on the planet has the most majors in their pocket. "