Sexton had to replaced by Ronan O’Gara midway through the first half after aggravating the injury while attempting a clearing kick.
The IRFU have also confirmed that Connacht lock Mike McCarthy is a major doubt for Ireland’s next Six nations encounter after straining the medial ligament in his right knee and will see a specialist later this week for further examination.
Brian O’Driscoll (right ankle) and Donnacha Ryan (back) will also see a specialist in the middle of this week for further review but they have not yet been ruled out of the trip to the Scottish capital.
Rob Kearney is recovering well after suffering a dead leg, while Sean O’Brien came off with a tight hamstring and will be monitored throughout the week but are expected to be fit.
Ireland are already robbed of the services of Simon Zebo who underwent surgery on his broken foot today and Cian Healy’s availability is in question after after he was cited for stamping on England’s Dan Cole today and will travel to London for an independent disciplinary hearing on Wednesday.