In 2001, AS Rocar București was relegated to the second League, and the owner of the team, Gigi Nețoiu moved along with part of the players, including Iacob to Universitatea Craiova.

In 2002, Iacob was transferred to Progresul București also known as FC Național where he played in 27 games and scored 4 times.

In 28 games he scored 13 goals and was noticed by Mihai Stoica, the general manager of Steaua București, who signed him on a free transfer.

They qualified from a group which included Standard Liège, Beşiktaş, Sampdoria, and Athletic Bilbao and beat Valencia, a former UEFA Cup winner in the next knockout stage.

In the 2006–07 season, FCSB qualified for the UEFA Champions League group stage, where they played Real Madrid, Olympique Lyonnais, and Dynamo Kyiv.

He was injured in his early days at his new team and did not manage to help them avoid relegation, despite playing a couple of matches.

In May 2011, he left the club, Iraklis having been blighted by financial problems which ultimately resulted in relegation from the top tier.