Isabella Lovin, Sweden’s minister for international development, told the Swedish newspaper Svenska Dagbladet, that Mr Sidibé should go.
“We have made clear on several occasions that we have no confidence in Sidibé. I have also said this to him in person,” she said.
The UK, the fourth largest donor to UNAIDS, giving just over $19m (£15m) in 2017, was critical of the body but stopped short of calling for Mr Sidibé’s resignation.
A spokesperson for the Department for International Development said: “The sector has been very clear that we cannot tolerate practices which don’t reach the standards we require. We expect immediate and far-reaching action from UNAIDS.”
At a meeting of UNAIDS’ governing body in Geneva this week Mr Sidibé said he would step down next June, six months before his term of office is due to end