England rugby captain Dylan Hartley could miss this weekend's Grand Slam decider against France, according to reports.
The Daily Mirror say that the Northampton Saints star sat out training at Pennyhill Park today after picking up an injury.
Exeter Chiefs hooker Luke Cowan-Dickie would be the favourite to replace Hartley should the worst be confirmed.
England have already been crowned as this year's Six Nations champions, but still need to beat France in Paris to complete a first Grand Slam since 2003.
Northampton Saints centre Luther Burrell has been recalled to the England squad ahead of this weekend's Six Nations clash with Ireland.
The call-up marks a return to the international fold for the 28-year-old, who was famously dropped from the World Cup squad at the last minute by former coach Stuart Lancaster.
Burrell admitted the rejection left him "broken" and was subsequently given time off by the Saints to get over the blow.
However, he will now have a chance to impress new boss Eddie Jones after Bath's Ollie Devoto was ruled out with concussion.
The new North Stand at Northampton Saints' Franklin's Gardens will be officially opened today (February 13).
The 2,000-seater Barwell Stand has been used since early November but a ceremonial cutting of ribbon will take place this afternoon before Saints' Premiership clash with London Irish.
The day will be dedicated to the Barwell family who have played a key role in the running of the club in recent years.
A number of Saints legends will also be paraded in front of the crowd before kick-off.
"Although the Barwell Stand will honour the name for years to come, it is only fitting that supporters are given the opportunity to show their gratitude and thanks to Keith and the rest of the Barwell family for what they have done for Saints over the years which has culminated in us being where we are today - one of the best clubs in England.
One of Keith's core beliefs was that the club is bigger than any one individual, which is why we're inviting players who have put their names in the history books by having played hundreds of times in the first team to join us, and why we're working with local schools to tell youngsters about our past that we're so proud of.
It will be a great occasion, and we're looking forward to seeing another full house to help make this a memorable day for Keith and his family."
Northampton Saints v London Irish, Aviva Premiership, Saturday 13 February, 15:00
Alex Corbisiero has left Northampton Saints with immediate effect, the club has announced.Read the full story ›
Northampton Saints got 2016 off to the perfect start this afternoon beating Premiership title rivals Exeter Chiefs 8-3 in front of a record crowd at Franklin's Gardens.
Saints Hooker Mark Haywood got the only try of game in the first half. As the rain poured down the home side held firm and although Exeter scored a penalty with seven minutes to go, Northampton always looked like claiming a well deserved victory.
Northampton Saints will hoping to bounce back from their shock Boxing Day defeat at London Irish when they host Exeter Chiefs today (January 1).
The Chiefs are currently second in the Aviva Premiership and everyone involved with Saints knows they'll have to be at their best to win.
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Northampton Saints forward Alex Corbisiero has announced he is going to take a break from rugby at the end of the season.
The England prop has suffered a series of injuries in recent years and missed the World Cup this autumn with a back problem.
Corbisiero's contract at Franklin's Gardens expires in the summer and he says that instead of looking for a new club, he will take a year-long sabbatical instead.
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