Jose Mourinho publicly aired his displeasure with Chelsea's transfer business in the summer, before a late flurry saw the Premier League champions sign Pedro from Barcelona and Baba Rahman from Augsburg.
But he has ramped up his interest in a key player going forward according to the Express: http://www.express.co.uk/sport/football/607225/Chelsea-transfer-news-Alexandre-Lacazette-January-approach
Lyon's French international striker was heavily linked with a move away during the summer after hitting 27 goals in Ligue 1 last season, and the 24 year old could be the subject of a bidding war. Previously linked with both Liverpool and Arsenal, Arsene Wenger could see him as the man to solve the Gunners striker problems, while Liverpool's interest could depend on the future of Brendan Rodgers.
Lacazette is a highly rated young player, and a host of clubs were linked before he signed a one year contract extension, including tentative links with Newcastle United, but the reported £30 million plus fee put paid to those rumours.
Chelsea's first choice striker Diego Costa is backed up by Loic Remy and Falcao, but Mourinho is always on the look out for new talent, and Remy's lack of first team football throughout his spell at Chelsea could see him be the more disposable option.