The pair played together in the Saints academy.
Dyer told the Daily Echo: â€śIâ€™m very pleased for Adam, heâ€™s proved that he can play at that level, but Iâ€™m not surprised,â€ť said the Swansea winger, who scored against Saints on his return to St Mary's last season.
â€śI donâ€™t think there are many two-footed players like him in the Premiership and thatâ€™s a great talent to have.
â€śHeâ€™s literally been like that since I was in the youth team with him, and heâ€™s grown up and matured.
â€śOur youth team was packed with talent and [former academy coach] Georges Prost was amazing for us; he showed us how to play the right way.
â€śAdamâ€™s been like that all season. Iâ€™m so happy for him and that heâ€™ll get a chance for England, heâ€™s a great guy.â€ť
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