The 29-year-old is Bulgaria’s all-time leading goalscorer with 48 goals.
“It was a difficult decision but sometimes we have to take difficult decisions,” he said.
“I came to the decision that as of now I have retired from the national team.
“It wasn’t a decision I took lightly and I have reconsidered several times.
“Everything has a beginning and an end and that is today.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.