He won't be able to do so easily, because Minato can put pressure on him to the point where even standing still and activating MS is a problem, Minato also has 2 hax defenses, even more hax than yata mirror. First we know he has the kyuubi chakra, which blocked two of the strongest fire type attacks ever seen in the Manga, they also blocked a bunch of kunai, and even the magatama attacks from Madara's susanoo were blocked with no trouble.
This means that Minato doesn't have to watch Itachi quite as hard as someone without KM, because he can tank the majority of his attacks. for amaterasu and Totsuka, Minato has his s/t barrier, rendering both of them useless. Not to mention he is undoubtedly faster than Itachi. this means that he could port out of range, and then use his sensory tech to find Itachi, and reevaluate his plan of attack, should things get hairy.
Susanoo is easily avoided, and in a fight against Minato it is nothing more than wasted chakra. The ball is undoubtedly in Minato's court at this point.