Russell Brand has reportedly been taunted by fellow inmates at HMP Wandsworth in the days since his conviction, as he awaits sentencing for rape and sexual assault.

The 51-year-old comedian was found guilty on Thursday at Southwark Crown Court of one count of rape and three counts of sexual assault. He was cleared of two further counts of rape and one charge of attempted indecent assault. He is due to be sentenced on Monday, 9 November, and the judge has warned him to expect a lengthy custodial sentence.

According to reports in the Mail on Sunday, prisoners at the south London jail have repeatedly directed a foul-mouthed chant at Brand since his arrival, playing on his surname. A source told the newspaper that hundreds of prisoners have shouted the chant, which has left Brand “like a shadow” who rarely leaves his cell.

The same source said Brand only leaves his cell to collect his food at mealtimes before returning, and that the taunting has so far been verbal. Brand was denied bail ahead of sentencing and was taken to Wandsworth after the verdicts on Thursday.

Reports say Brand has been moved to the vulnerable persons’ wing of the prison. The source described basic conditions there, saying he has a small metal basin and a toilet in his cell, with a hot-water pipe running through the cells used to dry clothes, and no regular laundry collection.

Weekends at Wandsworth were described as particularly restrictive, with the prison said to be understaffed and prisoners given little time out of their cells. Dinner is reportedly served at about 4.30pm, after which prisoners return to their cells until 8am the following morning.

Brand was reportedly not expecting the verdicts and had not prepared for being taken into custody, arriving at prison without a bag or belongings. He was met by the prison’s assistant governor shortly after his arrival and warned to “expect the rough with the smooth”, and has also prayed with the prison chaplain, according to the reports.

Brand denied the allegations throughout the trial, which concerned offences said to have taken place between 1999 and 2009. Police have also confirmed that investigations remain ongoing into rape allegations made by two more women.

Wandsworth is one of London’s most troubled prisons, according to the Howard League for Penal Reform, which found the jail housing 1,457 inmates against certified normal accommodation for 894. The prison has faced repeated criticism over overcrowding, staffing and conditions.

His sentencing on Monday will bring to a close a four-week trial that ended with the jury deliberating for eight and a half hours before returning its verdicts.