The 53-year-old former political adviser was in hospital for a year after being admitted with coronavirus symptoms and placed in a coma, but has now been reunited with Garraway and their children, Darcey and Billy, at their family home.
Garraway, 54, said they were only “a few weeks into” having him back and he currently needs 24-hour care following his year-long fight back to health.
She told BBC1’s The Andrew Marr Show he was a “long way” from the man the BBC presenter had known, but he is “home and he is alive”.
She said: “He is devastated by Covid. He can’t really move, his communication is very minimal.
“There are moments when there’s up, so therefore in those moments you feel you know he’s in there. He has a lot of memory but the accessing of it is very limited.”
During his illness, Garraway made an ITV documentary, called Finding Derek, exploring his illness and its effect on their two children.
One scene saw Garraway recall being told by Mr Draper’s doctors that he was the most seriously ill person they had seen who remained alive.
Watch: Kate Garraway's heart breaking during husband's COVID-19 battle