
Determined to become a football player, he joined Nantes' youth system as a child and later landed at Le Mans, with whom he played in the French Second Division. The most recent French side he played for was Le Havre (2003-05).
Chelsea took interest in Lass and signed him in 2005, making him the youngest player in club history. He won the Premiership and a Carling Cup with the Blues. He later moved to Arsenal, where he remained only half a season before joining Portsmouth, where he would immediately see more playing time and become one of the top players in the Premiership.
Diarra is strong, solid in defence and covers a large part of the pitch. He is excellent in the aerial game despite not being too tall and he is capable of scoring goals from a distance thanks to a powerful shot. His versatility allows him to play both as a midfielder and as a right back.

| Liga Española 1ª División 2011-12 | Champions League 2011-12 | Copa del Rey 2011-12 | |||
|---|---|---|---|---|---|
| Games | 14 | 3 | 4 | ||
| Matches Started | 12 | 2 | 4 | ||
| Matches Subbed In | 2 | 1 | 0 | ||
| Minutes Played | 954 | 203 | 311 | ||
| Minutes Played Starter | 904 | 187 | 311 | ||
| Minutes Played Sub | 50 | 16 | 0 | ||
| Goals Scored | 0 | 0 | 0 | ||
| Headers Scored | 0 | 0 | 0 | ||
| Goals w/ Right Foot | 0 | 0 | 0 | ||
| Goals w/ Left Foot | 0 | 0 | 0 | ||
| Penalty Kicks Scored | 0 | 0 | 0 | ||
| Free Kicks Scored | 0 | 0 | 0 | ||
| Goals as Starter | 0 | 0 | 0 | ||
| Goals as Sub | 0 | 0 | 0 | ||
| Shots | 7 | 1 | 0 | ||
| On-Goal Percentage | 14 | 0 | 0 | ||
| Assists w/ Goal | 0 | 0 | 0 | ||
| Yellow Cards | 4 | 1 | 2 | ||
| Red Cards | 0 | 0 | 0 | ||
| Fouls Committed | 30 | 9 | 9 | ||
| Fouls Drawn | 11 | 3 | 3 | ||
| Steals | 85 | 14 | 20 | ||
| Turnovers | 91 | 20 | 29 | ||
| Penalties Received | 0 | 0 | 0 | ||
| Penalties Committed | 0 | 0 | 0 | ||
| Crosses Into Big Box | 5 | 6 | 1 | ||
| Total Passes | 662 | 173 | 193 | ||
| Passes Completed | 576 | 149 | 174 | ||
| Passes Incompleted | 86 | 24 | 19 |
| Liga Española 1ª División 2010-11 | Champions League 2010-11 | Copa del Rey 2010-11 | |||
|---|---|---|---|---|---|
| Games | 26 | 10 | 3 | ||
| Matches Started | 19 | 5 | 2 | ||
| Matches Subbed In | 7 | 5 | 1 | ||
| Minutes Played | 1808 | 528 | 152 | ||
| Minutes Played Starter | 1616 | 443 | 148 | ||
| Minutes Played Sub | 192 | 85 | 4 | ||
| Goals Scored | 0 | 0 | 0 | ||
| Headers Scored | 0 | 0 | 0 | ||
| Goals w/ Right Foot | 0 | 0 | 0 | ||
| Goals w/ Left Foot | 0 | 0 | 0 | ||
| Penalty Kicks Scored | 0 | 0 | 0 | ||
| Free Kicks Scored | 0 | 0 | 0 | ||
| Goals as Starter | 0 | 0 | 0 | ||
| Goals as Sub | 0 | 0 | 0 | ||
| Shots | 18 | 3 | 3 | ||
| On-Goal Percentage | 22 | 0 | 0 | ||
| Assists w/ Goal | 1 | 1 | 1 | ||
| Yellow Cards | 11 | 2 | 1 | ||
| Red Cards | 0 | 0 | 0 | ||
| Fouls Committed | 74 | 30 | 5 | ||
| Fouls Drawn | 21 | 7 | 2 | ||
| Steals | 163 | 40 | 9 | ||
| Turnovers | 157 | 40 | 9 | ||
| Penalties Received | 0 | 0 | 0 | ||
| Penalties Committed | 0 | 0 | 0 | ||
| Crosses Into Big Box | 4 | 2 | 2 | ||
| Total Passes | 1167 | 328 | 102 | ||
| Passes Completed | 1005 | 287 | 83 | ||
| Passes Incompleted | 162 | 41 | 19 |

ARTICLE - 26/11/2011
The French midfielder reaches the number in his fourth season on the team