Son announced in Seoul this morning that he will be leaving Spurs after Sunday's preseason friendly with Newcastle.
The 33 year-old attacker leaves Spurs after ten years at the club and Frank says they are prepared for the skipper's exit.
He said, "When a player is leaving a team, other players have a chance to shine. Brennan Johnson has played on the left, Wilson Odobert did well there against Arsenal, Mathys Tel can as well.
"For me personally, I would have loved to have worked with this fantastic person and player. He is a true Spurs legend in every aspect. One of the greatest players to play in the Premier League.
"It is never easy to find the perfect timing and me coming in from the side, it makes it a bit easier to to end on a high."
