Jose Mourinho has brought in box-office names for Manchester United this summer with Zlatan Ibrahimovic and Paul Pogba arriving. But who have been Mourinho's key summer signings in each of his past five management roles?
Here we take a look at one man from each of his recent spells who really helped to define his teams.
Diego Costa, Chelsea (second spell), 2014
Mourinho had spent one season back at Chelsea, finishing third, and wanted what he described as a "killer striker." The arrival of Costa injected goals and a nasty streak in his side, supplemented by the recruitment of Cesc Fabregas, and it ultimately led to Chelsea becoming champions. Although Costa had a more difficult second season, which included him throwing a bib in Mourinho's direction, he is still valued by his club, who have not taken kindly to Atletico Madrid's attempts to re-sign the striker.
Mesut Ozil, Real Madrid, 2010
Just 21 at the time, Ozil had been a stand-out performer for Germany during their run to the World Cup semifinals and Mourinho wanted a player who could make an impact behind the striker. Mourinho brought him in from Werder Bremen for £12m and was repaid with frequent classy displays. Mourinho once commented that "every time he touches the ball, the ball goes beautiful." When the midfielder eventually left for Arsenal, he cost £42.5m, making him the most expensive German footballer and the most expensive player sold by Madrid.
Wesley Sneijder, Internazionale, 2009
Sneijder had not lived up to expectations at Real Madrid under Manuel Pellegrini, but Mourinho saw the potential and recruited the Dutchman, who went on to be a key man in delivering a treble (Champions League, Serie A, Coppa Italia) that season. The 25-year-old was relatively cheap at €15m and turned out to be smart business by the Portuguese, but he was only one of several shrewd signings by the club, including Diego Milito. The pair kept in touch after Mourinho's departure, with Sneijder saying they had a "great relationship."
Didier Drogba, Chelsea (first spell), 2004
There were question marks over Drogba when Mourinho brought him in from Marseille for £24m, but the Ivory Coast striker went on to vindicate the manager's faith spectacularly in the long run. The Chelsea manager said, at the time, that he would turn Drogba into a star and he did. The striker helped Chelsea to their first league title in half a century then developed further as a player and went on to become a club legend, eventually scoring the winning penalty for them in the 2012 Champions League final.
Paulo Ferreira, Porto, 2002
Ferreira made the switch from Setubal to Porto for £13.2m and it was the start of a wonderful journey with Mourinho: the defender went on to win the UEFA Cup and Champions League in successive seasons with him while playing for the Portuguese club before being brought by the manager to Chelsea. At Porto, Ferreira was a regular in back-to-back, domestic title-winning seasons. More glory followed at Chelsea, where the Portugal defender was a player for nine years, winning the Champions League, Europa League and three titles among other honours.