AS Monaco's Bakayoko is set to join the Premier League winners this summer.
Manchester City, Celtic, Everton and Dortmund were also interested in the forward.
The Gunners are reportedly demanding around £3.5m to part ways with the Colombian international.
Muriel is also a target for La Liga outfit Sevilla.
Mariano arrives as likely replacement for French international, who is edging closer to Premier League switch.
Defoe's move to Bournemouth was made official on Thursday (29 June).
Seagulls boss Chris Hughton says his side are in the running for the 20-year-old defender.
La Viola had sought compensation over an alleged breach of employment agreement.
West Ham United and Lyon are also in the race to sign the Bayer Leverkusen striker.
The former Barcelona hero believes that his compatriot is ready to play at the Nou Camp.
Lukaku is keen to leave Everton after four years with the club.
However, Mateja Kezman stresses that Lazio midfielder is not for sale this summer.
Everton beat off competition from Arsenal and West Ham United to secure Nigerian prodigy.
Spaniard moved to Goodison Park in the summer of 2015 having previously been on loan with the Toffees.
Antonio Conte has told Costa he is not in his plans for next season.
Reports suggest the Reds could make a club record £70m bid for the RB Leipzig midfielder.
Chile star knows where he will be playing his football next season, but is not letting on just yet.
Nainggolan has been heavily linked with a move to Chelsea.
Keane's agent, Jamie Moralee, believes his client could become the best centre-half in Europe.
Keita has a £48m release clause in his contract that can be triggered in 2018.
23-year-old is expected to serve as the third choice goalkeeper for Ernesto Valverde.
Sanchez is currently away with Chile at the Confederations Cup.
IBTimes UK revealed on 23 June that the midfielder was not close to joining United.
Tony Cascarino says champions should be looking beyond Lukaku as a summer replacement for Diego Costa.
Suso also hoping Gianluigi Donnarumma remains at the San Siro.
United last won the league in 2012/13.
20-year-old midfielder expected to complete move to Bernabeu after Under 21 European Championship.
Chelsea are closing in on completing a deal for AS Monaco's Tiemoue Bakayoko.
Giroud is keen to ensure he receives regular game-time ahead of the 2018 World Cup.
22-year-old has agreed a three-year-deal with the La Liga side.