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"It's just a week to soon," said the Saints director of rugby.
"He returned to training yesterday and it was a close call.
"But he is not 100% fit and if we were a desperate team we could have gone with him and taken a chance but we have a good squad so we are not in that position.
"It's a really big blow but if you get to this stage of the season and only have worries about one of your players, that is a good position to be in."
The 24-year-old made his international debut for England at the Millennium Stadium earlier this year but will miss out on the chance returning and helping the Saints set the record as the only team to make it nine straight wins and complete their Heineken Cup season unbeaten.
