Kevin Pietersen has been fined for comments he made on Twitter about Sky Sports commentator Nick Knight.

The England and Wales Cricket Board (ECB) docked the batsman an undisclosed sum for openly criticising Knight on the social network.

Pietersen wrote: "Can somebody please tell me how Knight has worked his way into the commentary box for Tests? Ridiculous."

The sport's governing body condemned the outburst as "prejudicial to ECB interests and a breach of the England conditions of employment".

Pietersen, who previously sparked controversy when he used Twitter to announce that he had been dropped by England, said on Tuesday that he will continue to use the microblogging site indefinitely.

Part of the England star's latest fine was suspended for 12 months, according to the ECB.