Competitors and delegates from Sri Lanka, Pakistan, Cameroon, Ghana and Botswana have been missing since the start of the Games.
The Commonwealth Games in Birmingham started earlier this summer on July 28.
The missing competitors include 13 athletes and four others who were on the individual teams.
Nine of the 17 missing have been found, but eight are still missing.
Two of those still missing are believed to be young Pakistani boxers, named in the media as Suleman Baloch and Nazeer Ullah Khan.
Five others are from the Sri Lankan team, while one is a delegate from Ghana.
Earlier in the Games, a competitor from Botswana and one from Cameroon were also missing, but both have now been found.
Police and immigration officials are said to be working jointly to ensure the welfare and safety of competitors who have so far been located.
A West Midlands Police spokesperson said: “We have received a total of 17 missing person reports from visiting Commonwealth Games delegations – 13 competitors and four other delegation members.
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“Of these, nine have since been found and eight remain unresolved.
“We are carrying out investigations alongside immigration officers to ensure they are safe and healthy.”
Last week, a wrestler, a judo star and a judo coach from the Sri Lankan team were reported missing, after they had not been seen for four days.
It is believed the trio surrendered their passports in the Athletes’ Village and as a result were unable to leave the UK.
The Sri Lankan team released a statement at the time, with team spokesman Gobinath Sivarajah saying: “We have requested all athletes and officials to submit their passports to our respective officials in all villages after the incident.
“Police are investigating and the three cannot cross UK borders. What happened is really unfortunate.”
It is feared that the missing athletes have fled in the hope of not returning home once the Games are over, as the country is on the brink of a humanitarian crisis.
An economic crisis has also led to a shortage of medicine, fuel and food in the country.