Aitor Karanka has lifted the lid on three of Boro's new arrivals.

On Monday, Marten de Roon became Boro's third summer signing, following the earlier arrivals of Bernardo Espinosa and Viktor Fischer, while Jordan McGhee has also joined on a season-long loan.

Dutchman De Roon joined from Atalanta, where he won the club's Player of the Year in his single season in Italy.

"Marten knows how important this step is for him," Karanka said.

"He's a strong character - to play in Italy is not easy.

"When you're young and have gone to a league like Serie A and impressed everyone in just one year - that shows me a lot.

"I told him how good this group of lads is and he is really excited to start with us."

In June, Boro agreed a deal to bring in defender Bernardo Espinosa, following the expiration of his contract at Spanish side Sporting Gijón.

"Bernardo is the kind of central defender I like to have," Karanka said. 

"He is strong and he plays really well with his feet. We tick everything because he's a good player, a good lad, and he's experienced.

"Bernardo's attitude at Gijón has been amazing. He knows that to come here is a big challenge and I am pleased to have him."

Danish international Viktor Fischer arrived in May, transferring from Dutch giants Ajax for an undisclosed fee.  

"Viktor is young, talented, and when we met him he showed me that he really wants to be here.

"He has a good example in [Christian] Eriksen from Tottenham. Hopefully, Viktor can be just as good.

"We are really confident in him - he has everything to be successful here."

With four signings secured, the Head Coach is pleased with the way his squad is shaping up.  

"We have really good players and for sure we are going to have calls from other teams to sign them," he said.

"But we have to try to build the team as strong as we can. 

"It's nice when now we have meetings with other players to try to convince them [to sign]. 

"Now we are not a project like we were last season or two seasons ago. Now we are in the Premier League."

Aitor Karanka: It's Like We Haven't Been Away