Chris Brown's probation officers are allegedly unimpressed by his self-imposed rehab.

The 'Fine China' singer, who is still on probation for violently beating his ex-girlfriend Rihanna in 2009, checked into a treatment facility in Malibu, California, on Tuesday (29.10.13), just two days after being arrested for assault after allegedly breaking a man's nose outside a hotel in Washington D.C.

But sources connected to the Los Angeles County Probation Department told gossip website that the star's probation officers think his decision to seek help for his anger management issues is ''too little, too late.''

One insider said: ''Probation is gunning for this guy. They're embarrassed by what he's done over the last two years and they've had it.''

The department has been aggressively investigating last weekend's incident since they interviewed Chris on Monday (28.10.13) just hours before he checked himself into the rehab facility.

Probation officers are preparing to submit a report to a judge, who will decide whether to revoke his probation.

If Chris' probation is revoked, he could be sentenced to four years behind bars.