Wales captain Alun Wyn Jones is in danger of missing the Six Nations and Lions after it was announced he could be absent for at least 10 weeks.
The 35-year-old suffered the medial ligament problem during Wales’ final Autumn Nations Cup game against Italy at Parc y Scarlets on 5 December.
“We’ve spoken to the powers that be in relation to his knee,” said Booth.
“We think he’ll be double-figure weeks at the very least. If I said it to Alun, he’d say: ‘I’ll be back in eight. That’s the nature of the beast.
“He’s probably going to be somewhere around that sort of time frame, but it could be even longer which is disappointing for him and obviously for us.
“If anyone’s going to get back early, it’ll be him.”
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1. Dan Carter
He is a free agent once again after his stint with the Blues came to an end. In April, he quit the stalled Japanese scene where he won a title for the Kobe Steelers on the back of his success in France with Paris club Racing 92. The 35-year-old played 112 tests for New Zealand, winning 99 of them and scored 1598 points which remains an international record. It’s expected he will move to Major League Rugby.