Martinez is better. He did well with Wigan and in his first season with Everton. Belgium has a great squad that doesnt click together. He knows how to play good attacking football so it might help build chemistry.
Also its not like other national teams assigned top coaches. Who is even available?
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I think he is a very reliable player. Always works his socks off in offense and defense, can dribble, shoot from distance and most importantly he can cross very well. A very classical winger. I rate him a lot higher than Pereyra on the wing. Good signing for Inter but 3 years too late. He is very dependent on his fitness and he is not young.
Perisic, Icardi, jovetic, Candreva, brozovic, Banega, Miranda, Kondogbia. This squad has good potential that needs unlocking. Mancini only managed to get Icardi and Brozovic to perform at a decent level and completely flopped with the rest. Their squad perform at 50% of its potential. A proper coach can make them perform much better.