Bellerin has been a regular in the Arsenal first-team squad.
Tierney caught the eye after a brilliant performance for Scotland in a 2-2 draw with England.
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.
Mariano arrives as likely replacement for French international, who is edging closer to Premier League switch.
Everton beat off competition from Arsenal and West Ham United to secure Nigerian prodigy.
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.
Sanchez is currently away with Chile at the Confederations Cup.
Tony Cascarino says champions should be looking beyond Lukaku as a summer replacement for Diego Costa.
Giroud is keen to ensure he receives regular game-time ahead of the 2018 World Cup.
The Gunners are under pressure to make key additions following last season's fifth place finish.
L'Equipe lists seven clubs interested in the 21-year-old, including Tottenham and Manchester United.
German giants are now focusing on signing younger players.
"It's clear to most fans that we are desperate for centre-forwards," says Hammers co-chairman.
Pires was part of the Arsenal Invincibles squad in 2003/04.
Liverpool and Juventus have also been linked with his services in recent times.
Arsenal made £30m bid for Lemar, which was turned down by Monaco.
Nicol does not think Aguero will want to play second fiddle to Gabriel Jesus.
Manchester United star already played under Ernesto Valverde at Athletic Club Bilbao.
Sanchez is keen to reunite with City manager Pep Guardiola, according to reports.
Ex-Arsenal academy manager Andries Jonker is in charge of Wolfsburg's first team.