Champions League signings of the summer so far

Esteban Cambiasso (Leicester City to Olympiacos)
The 34-year-old Argentinian defensive midfielder has stamina, tactical intelligence, passing skills, work rate and experience – a key signing who can definitely move Olympiacos to the next level.
Vassiliki Papantonopoulou, Greece correspondent

ALL THE GROUP STAGE TRANSFERS

Iker Casillas (Real Madrid to Porto)
The arrival of the decorated Spanish goalkeeper was quite a surprise. He will be the star man in Julen Lopetegui's team, adding the experience required to match Porto's ambition.
José Nuno Pimentel, Portuguese newsdesk

Douglas Costa (Shakhtar Donetsk to Bayern)
The Brazilian could serve Bayern for years to come. He will face stiff competition, of course, but his speed and skill on the right, allied to his versatility and direct dribbling style, should make him a serious threat in the Bundesliga and the UEFA Champions League.
Türker Tozar, Turkey correspondent

Paulo Dybala (Palermo to Juventus)
His nickname is 'La Joya' (The Jewel) and Juve have certainly spent appropriately, paying a reported €40m for his services. Dybala, 21, was on target for the Bianconeri in the Italian Super Cup and should waste no time showing just what he can do with his magic left foot.
Paolo Menicucci, Italian newsdesk

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Edin Džeko (Manchester City to Roma, loan)
Showed a knack of scoring key goals while at City (despite never being a regular first choice) and will surely thrive as the main man; could take Roma to the next level. Shrewd business indeed.
Tom Kell, English newsdesk

Artem Dzyuba (Spartak Moskva to Zenit)
Dzyuba agreed his free transfer in February but had to wait until summer to join officially. The 26-year-old striker has already proved his worth, scoring a cracker against FC Ural before being named the league's best player for July.
Dmitri Rogovitski, Russia correspondent

Thorgan Hazard (Chelsea to Borussia Mönchengladbach)
The younger brother of Eden and the 2013 Belgian player of the year, Thorgan is the ideal playmaker, bring his new side creativity, goals and set-piece quality. He has already shown his worth while on loan last season.
Berend Scholten, Belgium & Netherlands correspondent

Maxime Lestienne (Al Arabi to PSV Eindhoven, loan)
The winger showed class at a young age with Club Brugge and will fill the gap left by Memphis Depay's departure for Manchester United – striker Luuk de Jong, in particular, will be hoping Lestienne can provide a similar level of creativity as his prececessor.
Berend Scholten, Belgium & Netherlands correspondent

Jackson Martínez (FC Porto to Atlético Madrid)
The top scorer in the Portuguese Liga for three years running, the powerful Colombian is set to follow in the footsteps of compatriot Radamel Falcao and create a goalscoring legend of his own at the Vicente Calderón.
Richard Martin, Spanish newsdesk

Júnior Moraes (Metalurh Donetsk to Dynamo Kyiv)
The arrival of this explosive, hard-working and pacy Brazillian forward has been the Ukrainian champions' biggest success this summer. Has there been such a complete striker at Dynamo since the heyday of the club's current coach Serhiy Rebrov?
Igor Lynnik, Ukraine correspondent

Lars Stindl (Hannover to Borussia Mönchengladbach)
When talking about bargains of the summer, look no further than former Hannover dynamo Lars Stindl (€3m release clause). A great finisher with outstanding stamina, he will add a real threat from central midfield.
Philip Röber, German newsdesk

Mathieu Valbuena (Dinamo Moskva to Lyon)
Ten months before UEFA EURO 2016 in France, Valbuena has returned to his homeland after gaining valuable experience in Russia. He will be a welcome addition to Ligue 1.
Emmanuelle Hingant, French newsdesk