Jamie Murray believes brother Andy can still get back to playing at the highest level and feels 2021 is shaping up to be a "huge" year for him.
Three-time Grand Slam champion Murray, 33, was forced to withdraw from next month's Australian Open after being unable to find a "workable quarantine" following a positive Covid test.
"He's done incredibly well to get to this point where he feels like he's in a position now to go out and compete against the best players in the world," Jamie told the Bunkered podcast.
"It's obviously been incredibly frustrating for him because he's had a lot of setbacks along the way.