Talks for Millwall to sign Ronald for approximately 2 million pounds did not progress shortly before the transfer window's closure on September 1. Ronald acknowledged the tradition of Millwall and expressed gratitude for the interest. He stated that talks did indeed occur and that there was a possibility of a transfer, adding that he is happy about the interest and the recognition of his work.

A fee, believed to be in the region of £2m, had been agreed between The Swans and Millwall for Ronald. Vitor Matos suggested the move had fallen through because personal terms were not agreed. Matos also said that, to his knowledge, Ronald did not reach an agreement and is therefore part of the team.

The planned deadline-day departure of 25-year-old Brazilian winger Ronald from Swansea to Millwall did not happen, which, along with a failed move for fellow winger Zeidane Inoussa to Portsmouth, caused concern among fans that another one of the club's deals might be at risk. Ronald, who joined Swansea in January 2024, has a contract with the club until 2027. According to Transfermarkt, his current market value is €3.00m. Coventry City and Corinthians have also been linked with the player.