The Blues have hired the former Leicester City supremo and Manchester City assistant to replace Mauricio Pochettino.
Now that Maresca's appointment is finalized, the club will turn its attention to transfer work.
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Per The Mirror, a goalkeeper may arrive, with James Trafford of Burnley a serious option.
A centre back is necessary, given Thiago Silva has left and Trevoh Chalobah may be sold.
The club are also assessing the market for a top class striker and a left-back for next season.