"I'm very delighted to be here and I'm just excited to get started," Blackett said.
"I can see that the fans have been great and I'm sure they will be great all season long so thank you to them."
GETTY
Virgil van Dijk is set to join Southampton before Tuesday
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A deal is expected to be wrapped up for the 24-year-old before Tuesday's transfer deadline, with Van Dijk available to play for Saints as soon as the international break is over.