Medhi Gregory Giuseppe Lacen (Arabic: مهدي لحسن; born 15 March 1984) is a retired professional footballer who played as a defensive midfielder.

After starting out at Laval, he spent most of his professional career in Spain, representing Alavés, Racing de Santander, Getafe and Málaga and amassing La Liga totals of 273 matches and seven goals over ten seasons.

Born in Versailles, France, to an Algerian father and an Italian mother,[2] Lacen started his professional career with modest Stade Lavallois and ASOA Valence.

For the 2005–06 season he moved to Spain, joining Deportivo Alavés which would eventually be relegated; he made his La Liga debut on 15 October 2005, in a 1–1 home draw against Villarreal CF.

[5] In late February 2011, with his link to the Cantabrians expiring in June, Lacen signed a pre-contract with fellow top-level side Getafe CF.