He is expected to leave the Northern Ireland job after five and a half years, during which time he has led the country to its first ever European Championship finals and the brink of a first World Cup in 32 years before Sunday's play-off defeat by Switzerland.
The Swiss qualified 1-0 on aggregate, the tie ultimately being decided by the hugely controversial penalty converted by Ricardo Rodriguez in the first leg in Belfast on Thursday.
Croatia, who had beaten Greece 4-1 in last week's first leg in Zagreb, will be playing in their fifth World Cup.
"But we know on the other side that management is such a hard job".
For the first 30 minutes Greece were in control.
Greece continued to enjoy more of the ball in the second period but when it came to finishing off an attack, either a pass would go astray or a defender would step in.
Padres and Dodgers will play 2018 series in Monterrey, Mexico
In addition, there are preliminary plans to also play games in Asia and the United Kingdom over the next few years. Major League Baseball continues to spread its influence internationally by adding a series in Mexico next season.
Northern Ireland manager Michael O'Neills' odds to become next Rangers manager have shortened after his side failed to qualify for next summer's World Cup - but Gers fans don't want him anywhere near Ibrox.
Greece did put the ball in the net in the 79th minute, but substitute Dimitris Pelkas was correctly called offside.Bologna defender Vasilis Torosidis' shot was blocked by Subasic with just three minutes left, denying Greece even a consolation strike. "The players are devastated but I couldn't be any prouder".
Despite his heroics in charge of his national side, O'Neill's lack of experience at club level is scaring Rangers fans off.
Switzerland scraped into their fourth finals in a row 1-0 on aggregate, after being held at home by a valiant and workmanlike Northern Ireland who came desperately close to forcing extra-time.
"But from a football point of view, Michael's first thought is to defend and he has Premier League defenders in the Northern Ireland squad".