Sportsmail revealed on Thursday that Bullard had been given a two-week suspension after a breach of discipline during a training camp in Slovenia.
The 32-year-old reportedly turned up unable to train last week. He is believed to have returned to England with his team-mates before being ordered to stay away from City's training ground for two weeks.
Paying the price: Jimmy Bullard has been suspended by Hull
The 32-year-old was omitted from Hull's 2-1 pre-season victory at non-league Winterton Rangers on Wednesday night.
Bullard has two years remaining on his ?45,000-a-week contract at the KC Stadium and has repeatedly been linked with a move away from East Yorkshire over the past 12 months, spending the second half of last season on loan at Ipswich.
The Tigers said in a statement said: 'Hull City AFC can confirm that Jimmy Bullard has been suspended pending an inquiry into recent events.
'The club will be completing the investigation before making any further comment.'
Out of favour midfielder Bullard suspended by Hull for being unable to trainWarnock admits to transfer frustrations but looks set to sign BullardQPR hoping to make Hull's Bullard their first signing of the summerNewly promoted QPR in talks with veteran trio Bullard, Kewell and Neill