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News of the deal comes at a time when Isak continues to be linked with a move to Anfield; the Reds have already had a £110m bid rejected for the forward.And when asked he was about transfers following the Champions League draw, Reuben said: "They should rest assured we are working hard.
We have worked hard all summer to make sure the team is in the best possible condition to compete at the highest level of football.
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"That is what we always want.
"We've been training in the mornings, and he trains at a different time, when no-one from the team is around.
"As captain, and for us players, it's a tough situation because we want to have the best players with us.
"That's something we can't control.
It's already been a busy summer for the Premier League champions but they could still pull off a couple of blockbuster signings as the window comes to a close.
Alexander Isak's future remains unresolved, with the striker refusing to play or train for Newcastle United.
Liverpool remain interested in a deal for the Swede.
Meanwhile, Marc Guehi has been a player of interest all summer and Liverpool could still launch a last-minute deal for the Crystal Palace defender.
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"We're really missing our striker, a player who scored more than 20 goals in the Premier League last season, so, of course, he's someone we feel the absence of.
"We hope to have our best player back.
But unfortunately, this is a situation that neither I nor any other player can control."
Eddie Howe's side are without a win in the league this season after their draw with Aston Villa on the opening day was followed by a last-gasp defeat to Liverpool earlier this week.
But Reuben believes his side have deserved more from their opening two Premier League games of the season.
"We have been really good.