Lewis Koumas is regarded as one of Liverpool’s most exciting prospects, and the 18-year-old made his first full start for Wales last night against Montenegro. Starting out in his favoured left-wing position, the teenage forward was named in Craig Bellamy’s starting XI as the new Wales manager got the first win of his tenure with a 2-1 performance away in Niksic, with former Liverpool man Harry Wilson stealing the show. As for Koumas, though, the attacker was brought off at half-time as the Liverpool youngster endured a difficult night against Montenegro, where the teenager showed his lack of e…