Khloe Kardashian is apparently becoming increasingly worried for the safety of her husband, Lamar Odom, as he hasn't touched base for three days after she booted him out. The pair had had an argument last Wednesday (21st) August that provoked the Kardashian sister to chuck the NBA star out of the house.

Khloe Kardashian
Khloe Put Her Foot Down In A Long Fought Battle Over Lamar's Drug Use.

Khloe had attempted an intervention related to her concerns over Odom's alleged drug use in the downtime now the basketball season has ended, reports TMZ. It has been reported that Odom has battled with crack cocaine addiction for at least two years; a problem that has seen the basketball player admitted to rehab for three weeks last year. A representative for the sports star insists that Lamar is fine but would not disclose any details regarding his whereabouts.

Sources connected to Odom say that attempts to contact the sports star on his own side and Khloe's have proved useless. Concerns have mounted that Odom has gone off the rails, hiding himself away on a days-long crack cocaine bender. Khloe and Lamar are separated and possibly close to divorce, say sources, after the 29 year-old couldn't take her husband's drug problems any longer. Their separation was effectively declared when Khloe kicked him out when he refused her intervention attempt where she tried to persuade him to go back to rehab.

Khloe Kardashian Split
Khloe Is Said To Be Worried Over Her Husband's Whereabouts After Their Argument.

Though apparently now living apart, neither party have conducted a divorce lawyer and Lamar doesn't seem to have made any contact to confirm his safety yet. A divorce is on the horizon, though no steps have been taken yet, predict TMZ's sources. If they do divorce, their hard-fought pre-nup agreement will mean that there'll be little to fight over.

At breaking point, Khloe took to Twitter to vent her rage via a foul-mouthed rant, though didn't mention any names: "Really hard to sit here and listen to people talk sh*t about my family! F*ck you and shame on you! I'm too protective for this sh*t!" "Khloe is more concerned about saving Lamar than ending her marriage," said a source.

Lamar Odom Khloe Kardashian
The Couple In Happier Times: Will They Now Divorce?

The pair were married in 2009 just four weeks after they met and their relationship has been a rollercoaster, with circulating rumours that Odom cheated on the reality TV star and an undercurrent of hard drug use of his behalf.

Odom was last seen picking up suitcases from their Calabasas home and driving away.