[1] As a youngster, Lagab took part in the Tour de l'Espoir, a stage race within his own country for young and talented riders.

[8] With this team, he took part in the Tour d'Alger in which he won the third stage, with start and departure in Alger as well as the general classification at the end.

[15] He then won the Grandglise criterium in Belgium before taking part at the 2009 Mediterranean Games in Pescara in which he placed 17th in the individual time trial and 19th in the road race.

[16][17][18] In the Tour des Aéroports in Tunisia he placed second in the first stage, before clinching the silver medal at the individual time trial of the 2009 Arab Cycling Championships.

[32] He went on to take part in the 2010 Arab Cycling Championships in Tunis where he took the silver medal in the individual time trial event.

[34] There he also finished fourth in the team time trial (with Abdelmalek Madani and Hichem Chabane) and sixth in the road race.

[35][36] A newly set up UCI Continental Team in Algeria called Groupement Sportif Pétrolier Algérie contracted Lagab for the 2011 season, giving his career a new lift.

[50] In the capital of Mozambique he finished in the fifth position of the road race, and he won the bronze medal at the individual time trial.

[54][55] Then in Eritrea he finished 4th in the team time trial of the 2011 African Cycling Championships alongside Abdelbasset Hannachi, Abderrahman Bourezza and Abdelmalek Madani.

[60][61][62] Algeria ended up being the first country to arrive at the finish with three riders (the others being Abdelmalek Madani and Youcef Reguigui), which brought Lagab and his teammates the gold medal in the team road race event.

[69] In June, he won another gold medal at the national road cycling championships, winning the individual time trial in Souk Ahras.