In December the Brazil international underwent a successful procedure to remove a cavernoma - a cluster of abnormal blood vessels in his brain - after suffering from acute dizziness.
A statement on Roma's official website confirmed that the 28-year-old received positive news from a check-up on Thursday and that his workload in training will be increased gradually.
"Leandro Castan had a check-up earlier today that showed he is recovering very well following his operation," the statement read.
"The player will begin training again and will gradually start to head the ball and increase his workload."
Castan has made 75 appearances for Roma since joining the Serie A outfit from Brazilian club Corinthians in 2012.
‘The pure simplicity of the way Slot has managed the squad is probably the biggest thing I could say about him. It’s not broken, so let’s get on with it’: Liverpool legend full of admiration for Jurgen Klopp's successor at Anfield
‘I trained at Spurs and thought they’d give me a chance. But I received a letter thanking me but saying they didn’t think I was good enough – I was gutted’: How Tottenham missed out on signing Wales legend John Toshack
