Root thanks England's lone fan for devoted support
After winning by seven wickets, Root telephoned Rob Lewis, who had been cheering from Galle fort overlooking the cricket stadium.
The 37-year-old stayed in Sri Lanka after England quit the tour in March without playing a test because of the coronavirus pandemic.
With spectators and media banned, Lewis was kept away from the stadium when the match eventually started last week.
Root said Lewis was a "beacon for everyone at home".
"Rob? Hello mate, how are you? It was nice to see you finally up on the fort," said Root.
"That's why I wanted to come over, on behalf of all the lads we really appreciate your support and it's an incredible story and journey that you've been on."
Lewis said the call was "an unbelievable gesture", and that he would be watching when the second Test starts Friday.
Root tweeted a video of him making the call to Lewis who could be seen on the ramparts of the UNESCO world heritage site.
Whilst in Sri Lanka, Lewis has worked remotely as a web designer and done stints as a nightclub DJ.