Chelsea manager Jose Mourinho has reportedly to launch another bid to sign Brazilian midfielder Douglas Costa this summer, reports The Mirror.
During January transfer window, the Blues were close to secure the signature of the 24-year-old playmaker, but an agreement was not materialised and the west London club eventually turned their attention to the Colombian winger Juan Cuadrado.
However, the reports has suggested that the Premier League leaders are confident that an offer of £20m will persuade Ukrainian outfit to sell Costa, despite having interest from the Spanish giants Real Madrid and Barcelona.
The midfielder is desperate for a Champions League football and he wants to move to the Stamford Bridge, who scored three goals in 22 games for Shakhtar this season.