Celtic have been linked with many players already this summer and it’s clear the club are looking at both established first-team competitors and youngsters with potential. Last summer, the Bhoys arguably got the balance on that all wrong with not enough quality added to Brendan Rodgers’ squad. As the hunt continues for stars who can immediately improve Rodgers’ starting options, it’s important that work on those prospects also goes on. One teenager linked with the Bhoys is Costa Rica international Andy Rojas, who recently became his country’s youngest representative at the Copa America tournam…