Stoke City have told Chelsea that they must include one player on loan in the potential deal to see Asmir Begovic move in the opposite direction, according to reports from the Express.
The 28-year-old has emerged as a top goalkeeping candidate for manager Jose Mourinho following the departure of Petr Cech, who completed a move to Arsenal.
However, Stoke have given the Premier League champions a three-man short list as Mourinho may need to decide who to send out.
The Potters are open to letting him leave for the price of £8million plus one of the mentioned players, with the keeper likely to serve as backup to first-choice Thibaut Courtois.
Begovic has been a vital member for his side this season, making a total of 37 appearances in all competitions while managing to keep seven clean sheets.
Apart from the Blues, Manchester United were also monitoring the situation of the Bosnia and Herzegovina international amid speculation that David de Gea was set for a move to Real Madrid.