QPR defender Christopher Samba admits he "let the side down" in Monday night's west London derby defeat at Fulham but was quick to hit out at those questioning his value.
The 29-year-old arrived to much fanfare in January but in a 3-2 loss at Craven Cottage he showed little of the ability that prompted Rangers to fork out a reported Â£12.5million. Samba gave away the penalty from which Dimitar Berbatov opened the scoring, before losing possession under pressure to allow the Bulgarian to net his second goal.
"I'm really sorry I let the side down," the defender said through his Twitter account, @cs4christsamba1.
"Really upset with my 1st half performance I can't say sorry enough to all the supporters, won't give up."
Samba also forcefully responded to being called a "negro" on the social network, calling the user who addressed him as "racist" and "small minded".
A little later he added: "Before I go tonight I just wanna say I see a lot of you talk about I shouldn't say sorry, well when I'm wrong I'm wrong I hold my hands up.
"Then 2nd of all to all you keep talking about 100k performance, tell me what is a 100k performance? we as players go out and give our all.
"We do are best every week, what I get paid has nothing to do with any of you, as for my price tag I didn't put a price on my head, grow up pls."
After his move from Anzhi Makhachkala to QPR in January, Samba was reported to be picking up a weekly wage of £100,000, but the club have since said the actual sum is lower.