Brendan Rodgers recently left Celtic for Leicester City.
Rodgers recently left his managerial role at Celtic to become the manager of Leicester City in the Premier League in England.
The former Liverpool boss played Johnston a number of times in the first team, but the 19-year-old striker does not seem to be bothered about his departure.
Johnston told The Scottish Sun about Rodgers: “I wasn’t too down. The old gaffer liked me and gave me opportunities, which I was really grateful for.
“But managers moving on is a part of football, and it’s just something we have to deal with.”
Rodgers was hugely successful during his time at Celtic, as the former Swansea City manager guided the Hoops to two successive domestic trebles and the Scottish League Cup this season.
However, managers come and go, as Johnston says, and it is great of the youngster to have such a mature and positive attitude.
Neil Lennon is in charge of Celtic until the end of the season, and the Celtic Park faithful should be confident of the Hoops winning the Scottish Premiership and the Scottish Cup.
According to Celtic’s official website, Johnston has made 23 appearances in all competition for the Hoops so far in his career, scoring three goals in the process.