The contract includes an option to extend his stay at the Nou Camp for a further 12 months.
The Spanish defender has been a target for the Catalans all summer.
The Real Madrid striker and the Chelsea midfielder have already played under Mourinho.
Keane joined Everton for a club-record fee of £30m from Burnley on 3 June.
Lacazette set to become Arsenal's second signing of the summer transfer window.
Honduras international likely to play for Barcelona B should move to Nou Camp be completed.
Butland is hoping to fully reclaim the number one spot at Stoke after recovering from ankle injury.
Spanish sensation expected to make a decision on his future in the coming days.
Hull City midfielder available for reduced fee after the Tigers' relegation to the Championship.
The German side believe they are "immune" to bids for the 22-year-old midfielder.
Bayern have completed most, if not all of their transfer business this summer.
Sport claims that both clubs were ready to pay more than £21.9m to lure him away from the Nou Camp.
The 19-year-old striker rejected moves to Newcastle United and Brighton.
Klopp signed a six-year contract with Liverpool last summer.
Los Colchoneros will expose a loophole to secure the Spanish winger - before signing him in January.
Ivan Zamorano says Sanchez is unlikely to win the Champions League in north London.
AS suggest Jose Mourinho sees the Spaniard as a perfect fit for his side.
A new left-back and a central midfielder are much-needed at Anfield says ex-Germany international.
Rooney is open to the prospect of returning to Everton.
Defoe, 34, rejoined Bournemouth on a three-year deal.
Bakayoko has passed medical and agreed terms ahead of £35m move to Stamford Bridge.
Spanish forward now fully focused on the Magpies' return to the Premier League.
Real Madrid superstar posed topless with ex-Sheffield midfielder in a pool.
Spurs are reportedly demanding £50m for the England international.
Keita valued at £70m by RB Leipzig while Southampton defender Virgil van Dijk could cost a similar amount.
Arsenal and Tottenham Hotspur has also been linked with the defender in recent times.
Real Madrid were thought to be favourites to sign the 18-year-old this summer.
Reports in Portugal suggest an offer of £70m for the pair has been rejected.
Lehmann was part of the Arsenal Invincibles squad.
The Frenchman has revealed his desire to win more trophies with the Gunners.