Greenwood and Manchester City midfielder Phil Foden were shunned by England coach Gareth Southgate for his latest squad selection after being sent home last month for inviting women back to their Rejkavik hotel room.
Solskjaer says he has had a 'good chat' with Southgate.
"Mason is one of the top strikers of the future for England," he said. "He will play many games for England.
"This has been a learning curve for him. He needs to reflect."