The Baghlan Group is a company that specialises in oil, gas, construction and transportation, mainly in Azerbaijan.

In 2004, he became owner of local football club FC Baku, a team in the Azerbaijan Premier League.

On 10 June 2014, Mammadov agreed to take ownership of another European football club - this time it was the English Championship side Sheffield Wednesday .

The bid for SWFC was rumoured to have been around €50 million[4][5] however, at the beginning of September, due to Mammadov's failure to meet financial obligations and complete the takeover, Milan Mandarić called the deal off.

[7][8] Later that year, Mammadov's failure to provide promised investment of around £4 million to fund transfers for Lens resulted in Lens fans calling for a boycott of the club's main shirt sponsor[9] and saw the club threatened with relegation to League 2, but while some press reports suggested Mammadov was in serious trouble,[10] others suggested a complex web of oligarch connections might allow the situation to be salvaged.