The skilful 23-year-old centre, a product of the Warriors Academy, impressed during his loan spell north of the border and made ten appearances for Edinburgh, including starting the narrow one-point defeat to Cardiff Blues in the Heineken Cup in October.
However, he has now returned to Sixways as the club gears up for a big 2011 and the countdown to the RFU Championship play-offs.
Head Coach Richard Hill said: "To have an international quality player coming back into the squad now is a fantastic lift to us all as it will add real competition in the centre berth as we build towards the league play offs.
"Alex knows he has a lot of hard work ahead of him to force his way into the team. The squad has moved on well since September and is familiar with the attack and defence strategies we know employ.
"His attitude has been fantastic throughout this loan deal. He has always kept in contact with the coaching staff and players and also made several trips down from Scotland to watch a number of our games at Sixways.
"Alex is massively enthusiastic about the challenge ahead for him and the club. He is determined to help Worcester Warriors achieve the success we crave this season in the RFU Championship."