's former coach Jonas Bjorkman has backed the Scot to return to the highest level of tennis, saying: 'Once a champion, always a champion'.
'Absolutely he can get back to the top 10 level,' said the Swede, who coached Murray in 2015.
'With the calibre of player he is, if he is healthy I have no doubt he is going to be back to challenge for the top five.'
Murray has returned to the doubles court this summer after having hip surgery in January and is planning to gradually build his fitness for an eventual singles comeback.
'He has had a problem with his hip for a long time but there is no doubt he can come back to that level and maybe play even better,' said Bjorkman.
'Without pain, without the stress of the pain, he's going to have a smile on his face just going out and being more free.
'It was a smart move to start slowly, playing doubles. That will help and hopefully he will find the right time to play singles.
'He is so professional in everything he has done in his career and with such a great team behind him they will make the right decision.
'When the time is right, he will come out and be physically ready.'