Martin Montoya has signed a contract extension to remain with Barcelona until 2018.

Montoya, a 22-year-old defender, came up through La Masia.

Montoya's deal will contain a buy-out clause of £16.65 million.

Inter Milan and Liverpool were among the clubs interested in Montoya.

Alen Halilovic has agreed to join Barcelona.

An initial fee of €2.2 million will be paid to Dinamo Zagreb, with add-ons to come depending on first team appearances. The 18-year-old Halilovic will start his career in Spain with Barça B after agreeing upon a five-year deal.

Halilovic's natural position is attacking central midfield.

Fredy Guarín has signed a new contract with Inter Milan until 2017.

Guarín is a 27-year-old attacking midfielder that has a 7.41 WhoScored rating in 25 Series A starts this season.

Guarín first joined Inter on a loan from Porto before making the move permanent in June of 2012 for €13.5 million.

Arjen Robben has extended his contract with Bayern Munich through 2017. Robben's deal was scheduled to expire in June.

The 30-year-old winger has 55 goals and 36 assists in 98 Bundesliga matches for Bayern.

"I'm delighted we've now signed the new contract and I'll continue pursuing trophies with FC Bayern," he told the club website. "I'm now in my fifth season in Munich and there will be three more after this.

"There can be no better indication of how happy my family and I feel to be here and how much I enjoy playing for this club and with this team. I'm looking forward to the years ahead – and to plenty more trophies with FC Bayern."

SportBild had reported in February that Robben's salary would be approximately €8 million per season.

Arsenal has signed Santi Cazorla, Aaron Ramsey and Gedion Zelalem to new contracts.

Cazorla arrived to Arsenal from Malaga in 2012, while Ramsey was a 2010 arrival from Cardiff City.

Zelalem is a 17-year-old German midfielder that made his senior squad debut in the FA Cup in January.

Marc Bartra has signed a contract extension with Barcelona to keep him with the club until June 2017.

Bartra joined the Club as an eleven-year-old and worked his way up through the academy and Barça B teams before signing a first team contract in the -12-13 season.

“I’m very happy," said Bartra. "It’s a great feeling and I hope everything continues to go as well as they have done in my time at the Club so far. For me, Piqué and Puyol are my reference points - it’s a challenge to me to achieve what they have. Establishing myself in the team is a big test, but I am getting there”

Hervin Ongenda has signed a 12-month contract extension with Paris Saint-Germain to remain under contract until June 2017.

Ongenda is an 18-year-forward who graduated through PSG's academy.

Speaking to the club's official website, he said: "I want to continue my career at Paris Saint-Germain, a great European club where I came through the youth ranks and in which I want to play a role in the very ambitious project.

"I will give my absolute maximum to help the team reach new heights."