Collins â€” capped 58 times â€” has told his former Hibs striker he will live to regret not playing for Scotland.
He said: â€œIâ€™d tell Steven to pick up the phone right now and tell the manager he wants to come back and play for his country.
â€œFootball is a short career. Heâ€™s at his peak just now, scoring goals, and thatâ€™s when you want to be playing for Scotland.
â€œSteven or his agent should make the call. Will he regret it if he doesnâ€™t? Of course â€” 100 per cent."