The move comes ahead of the new QNB Stars League season that begins on August 4.
Al Rayyan - who finished third last season - are strengthening their forward line as the team looks for more goals in the new season.
After the signing, the management of Al Rayyan thanked the management of the Al Arabi, the previous employers of Ibrahim.
Ibrahim will clearly add muscle to the firepower at Al Rayyan as the veteran forward has played a long time at Al Sadd also. Last season Ibrahim played for Al Arabi.
The 30-year-old is scheduled to join Al Rayyan at their pre-season training camp in Austria where the team will be based until July 25.
Al Rayyan will meet Al Duhail on August 1 in the one-off game Sheikh Jassim Cup (Super Cup).
Al Rayyan will kick off their QNB Stars League campaign with a match against Al Ahli on August 5.
Source: qsl.com.qa