Martinez was also happy with Ivan Ramis at the back.
"Not many foreign players can come into this league and cope with the physical side of the game.
"The know-how is important and the likes of Kone and Ramis are good examples how they have adapted. Being able to play in Germany and Spain has helped them a great deal.
"I was really impressed with Kone and I think he could have scored another couple of goals. But it will have boosted his confidence.
"Unfortunately we are losing players to the African tournament and other managers will tell you how difficult it is to lose important players at such a crucial stage of the season.
"I am sure that other players will come in and take the opportunity to shine."