Alexis Mac Allister began to shake the first time he met Lionel Messi. He started to second-guess himself, too.
'I didn't know if I give the (high) five or not,' the midfielder once joked. These days, the nerves have died down. So has any uncertainty about how to interact with his Argentina captain.
On occasion, it has taken only a look for Mac Allister and Messi to be on the same page. The instructions from Argentina's talisman can be simple enough: run.
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