Gary Cahill (Bolton, £7m); Kevin de Bruyne (Genk, £6.7m); Patrick Bamford (Nottm Forest, £1.5m).
Andre Villas-Boas still has a squad of players he is unable to call his own, but the Chelsea boss made a further attempt to leave his mark during the January transfer window.
Cahill is the type of centre-back Villas-Boas likes - comfortable on the ball, fast over the ground and tactically astute, and will no doubt prove to be a fine signing for the Blues.
The 26-year-old's experience of playing alongside John Terry for England is also a plus for Villas-Boas, although it is more likely that Cahill will be the former's long-term successor.
Meanwhile, Chelsea also landed highly-rated Belgian winger Kevin de Bruyne, who impressed against the Blues during the Champions League for Genk.
The 20-year-old joined Chelsea on deadline day, although has been loaned back to Genk for the remainder of the season in order to continue his development.
Chelsea also completed the signing of teenager Patrick Bamford from Nottingham Forest shortly before the deadline. The striker is very much regarded as a player for the future.
Alex (Paris St-Germain, £4m); Josh McEachran (Swansea, loan); Gael Kakuta (Dijon, loan); Nicolas Anelka (Shanghai Shenhua, free); Patrick van Aanholt (Vitesse, loan); Kevin de Bruyne (Genk, loan); Milan Lalkovic (ADO Den Haag, loan).
Nicolas Anelka confirmed in December that he would be leaving Chelsea for Chinese side Shanghai Shenhua, and the 32-year-old completed his move during January.
Alex was also allowed to leave the club, having fallen out of favour under Villas-Boas. The Brazilian joined Paris Saint-Germain shortly after the signing of Gary Cahill.
Meanwhile, Gael Kakuta and Josh McEachran will gain valuable first-team experience away from Stamford Bridge, with the former moving to Dijon and the latter to Swansea, both on loan.
Should McEachran impress at the Liberty Stadium, he is likely to feature more prominently for Chelsea next season.
Chelsea were constantly linked with Lille star Eden Hazard and Shakhtar Donetsk midfielder Willian, and were even credited with having made a formal bid for the latter.
Donetsk, however, rejected Chelsea's proposal, and the Brazilian remains at the Donbass Arena until the summer at least.
Hazard, meanwhile, was reported to have agreed terms with Chelsea over a January move, but has since stated he will not leave Lille until the summer at least.
And, when he does depart the Stade Lille Metropole, the Belgian expects it to be for a team in the Premier League. Stamford Bridge awaits.