Courtois has been tipped to part ways with the Premier League club this summer following a break down in contract negotiations, and reports that Real Madrid had shortlisted the 26-year-old alongside Roma's Alisson.
Thus, the Blues may be forced into selling the Belgium international this summer if talks over a new deal remain at an impasse, as his current terms expire next summer, which would enable him to leave on a free transfer.
According to the Daily Mail, Chelsea could be forced to consider their financial position in their search for a stopper. However, due to concerns over the funds owner Roman Abramovich will part with this summer, and as a result Stoke's Butland has emerged as a target.
The England international had been subject to enquiries earlier in the season from Chelsea, and the club know he would cost considerably less than their other target Alisson - who is also of interest to Liverpool and has been earmarked for a fee in the region upwards of £75m.
Chelsea see Butland's existing Premier League experience as an added advantage, but with the Potters desperate to keep hold of the 25-year-old following their relegation to the Championship, the report claims they will 'reluctantly' listen to offers only if it is a British record fee - which would need to surpass the £30m Everton paid for Jordan Pickford.
Butland missed just three of Stoke's league games last season following a wretched run with injuries the year prior which resulted in just five Premier League appearances.