Saracens boss Mark McCall says "everybody would want" Owen Farrell in their side, with Racing 92 believed to be in talks to sign the England captain.
Bath missed the chance to top of the Premiership table as they crashed to a convincing 35-22 defeat to Leicester.
Bath top the Gallagher Premiership at Christmas after winning an absorbing battle with fellow title contenders Harlequins 25-17 at the Rec.
England lock George Martin has agreed a new contract with Leicester Tigers after playing a starring role at this year's Rugby World Cup.
Sale produced a superb second-half show to open their Champions Cup campaign with a 28-5 victory over Stade Francais at AJ Bell Stadium.
A hat-trick of tries from Leicester's Tommy Reffell ensured Newcastle's desperate start to the season continued with a 47-3 Premiership defeat.
Saracens dealt with the early loss of three key players to make it four wins in a row as they rain in six tries during a thumping 38-10 victory over Harlequins.
A round-up of Saturday's Premiership action as Harlequins go top of the table with win at Leicester, while Sale prevail again away to Bristol.
South Africa's World Cup final match-winner Handre Pollard tells Sky Sports clinching the title with the expectancy on the squad made it "extremely special."
Jamie Shillcock returned to haunt former side Bath as he scored the winning penalty with the last kick of the game to snatch Leicester a 25-24 Gallagher Premiership win.
Bath maintained their winning start in the Gallagher Premiership with a 25-16 triumph over defending champions Saracens, while Sale and Bristol were also victorious.
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Players from Northampton and Leicester, including Courtney Lawes and Ben Youngs, will join England's World Cup training squad in Brighton.
Sale reached their first Premiership final for 17 years as they ended Leicester's hopes of back-to-back titles with a 21-13 victory.
Steve Borthwick has named Tom Harrison as England's new scrum coach as he finalised his staff for this autumn's Rugby World Cup.
A round-up of Saturday's Gallagher Premiership action as London Irish finished a difficult week on a high.
Leicester wing Chris Ashton scored a hat-trick en route to becoming the first player to record 100 Premiership tries.
Chris Ashton will retire at the conclusion of the 2022/23 season after an 18-year playing career in both rugby union and rugby league.
Leinster moved within 80 minutes of a Heineken Champions Cup final on home soil after seeing off Leicester Tigers' challenge with a 55-24 win at the Aviva Stadium.
Jasper Wiese scored the only try as Leicester reached the European Cup quarter-finals with a 16-6 win over Edinburgh.