Jim Mallinder is hoping Ben Foden will be fit to face Racing Metro after the full-back was forced off at Ospreys on Sunday.
Foden had to be helped to the bench after just 11 minutes at the Liberty Stadium, with James Wilson replacing the England man.
He was sent for a scan on his knee on Monday and looks to be a real doubt for Saturday’s crucial Champions Cup clash with Racing at Franklin’s Gardens..
But Mallinder is remaining upbeat after seeing Foden in good spirits following the 20-9 success in south-west Wales.
“Fingers crossed, it’s not too bad,” said the Saints boss. “He was involved in the post-match celebration - he stood up.
“Hopefully it’s not too bad and he’ll be back this week.”
Foden took to social media to update fans on his condition, tweeting: “Thanks for all the messages, gutted to come off but great result! Knee doesn’t feel too bad, scan today to make sure. Fingers crossed #COYS.”