Strauss underwent a scan on Sunday on the medial ligament injury he picked up in the opening moments of the game and is expected to be out for approximately four weeks.
Flanker Shane Jennings damaged his shoulder against Clermont and was replaced by Jordi Murphy in the final quarter.
Jennings will be monitored by the medical team and is considered a doubt for Friday's game alongside Isa Nacewa who suffered deep bruising to his arm.
Friday's game with Ulster could come a week or two too soon for Luke Fitzgerald, who has stepped up his rehabilitation programme this week, but it is hoped that the Ireland international could come into the frame for either the home game against Connacht or for the Edinburgh match away at Murrayfield the following week.
There was good news for the province with Eoin O'Malley successfully coming through his first outing in the province's 44-13 British & Irish Cup win over Jersey on Sunday afternoon and the centre will potentially come into the frame this week.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.