Southampton manager Russell Martin believes the club have made a really good appointment ahead of the new season. Southampton are looking forward to a Premier League return after securing promotion via the Championship play-offs at the first attempt. That has seen a number of players brought in to bolster the ranks ahead of the campaign, including Adam Lallana, Ronnie Edwards and Yukinari Sugawara. It is not just on the pitch that Southampton have welcomed new arrivals, though, with the club appointing a new under-21 manager following the departure of Adam Asghar earlier this summer. That man …