The 19-year-old was included in Scott Gemmill’s squad for the first time for the upcoming double header against Northern Ireland, but has had to withdraw due to a foot injury picked up in the Scottish Cup final defeat to St Johnstone.
Doig suffered a badly bruised heel during the match and was replaced by Lewis Stevenson in the 76th minute.
He had hoped to recover in time to feature for the U21s, but the matches will come too quick for the teenage left back, who has been attracting transfer interest after an impressive breakthrough season in the Scottish Premiership, with the club knocking back an approach from Watford last week.
“Obviously I’m gutted not to be involved in these games coming up but it’s still a massive honour to be included in the Scotland U21 squad,” Doig told Hibs’ official website.
“I’m working hard to get back to full fitness and hopefully I can build on what I’ve done this season and earn my place in future squads moving forward.
“I wish the guys all the best in the matches against Northern Ireland.”
New Hibs team-mate Daniel Mackay, who completes his move from Inverness Caledonian Thistle this summer after signing a pre-contract agreement with the Easter Road side, will link up with the rest of the Scotland U21 squad in Edinburgh on Saturday.
The 20-year-old forward will be vying for a place in the starting XI for the behind closed doors matches on Wednesday, June 2, and Saturday, June 5.