The 28-year-old Ivorian joined the club on loan from Manchester City in August, but has scored just twice in 11 games and has not played since 27 December.

His contract allowed him to be sold to Chinese Super League clubs in January, but he chose to stay at Stoke.

"When you hear everything is fine and you don't play, it's crazy," he said.

Speaking to the BBC's World Football programme, the Ivory Coast international added: "It is more than difficult. This is something that I want to know why - the coach told me I'm training very well and my attitude is very good. It doesn't make sense. It's painful."

But Potters boss Mark Hughes says the striker is a victim of circumstance and faces competition from Peter Crouch and new signing Saido Berahino.

"He was away [at the African Cup of Nations] for a while and during that time Peter Crouch came into that side and did really well," said Hughes.

"It's been difficult for Wilf to get back in.

"We've bought Berahino in the meantime, so that's an extra striker on the books. So he's just going to have to be patient, as all players have to be."

Bony, who joined City from Swansea £28m in January 2015, said he was not tempted by the money on offer in China.

He added: "My agent told me there was an offer but I refused to go because my plan is to stay in the UK to show more - to show that I'm not at the end."