Adelson picked up the injury in the the final minutes of Saturday's friendly with Wellington in Sydney.

The Mariners confirmed the left-knee injury Tuesday after Monday's scans. 

Adelson will meet with an orthopedic surgeon in Sydney this week ahead of a knee reconstruction.

"The Central Coast Mariners wish Jake all the best on his road to recovery," the club said in a statement.

The 20-year missed nearly nine months of football after rupturing his other ACL in December last year.

The winger/ fullback is a Blacktown City junior and spent two years with Everton before joining Western Sydney in 2014.

He signed for the Mariners in 2015 and made his A-League debut in round seven last season.