Diego Costa is set to be offered a two-year contract extension that will see his wages rise to £200,000-a-week at Chelsea, according to several reports.

Costa, who is the Premier League's top scorer with 13 goals in 16 appearances this season, is contracted until June 2019 on a deal worth around £150,000-a-week, but both the Daily Mirror and the Daily Mail report that Chelsea want to secure their star striker on fresh terms.

Since moving to Stamford Bridge from Atletico Madrid for £32 million in the summer of 2014, the 28-year-old has scored 50 goals in 97 appearances for Chelsea and won the Premier League and League Cup during former boss Jose Mourinho's second spell in charge.

The Daily Mail reports that Costa is happy with life under current manager Antonio Conte, who has presided over a run of 11 consecutive Premier League victories since late September that has lifted Chelsea to the top of the table.

Atletico have been linked with re-signing Costa but Chelsea have never wavered in their stance that the Spain international is not for sale, and his impressive form this season has reportedly only made the Blues more determined to extend his stay and reward his performances.

Costa will serve a one-match ban after picking up his fifth booking of the season in Saturday's 1-0 win over Crystal Palace at Selhurst Park, meaning that £33m summer signing Michy Batshuayi is in line to make his first Premier League start for Chelsea at home to Bournemouth on Boxing Day.