Defender Jonathan Spector has extended his stay at Birmingham after penning a new two-year deal.
Bastian Schweinsteiger’s Bayern Munich future remains in doubt after Matthias Sammer admitted he could leave the club.
The 19-year-old is to sign a new deal which ties him to the Primera Division champions until June 30, 2017 and his new buy-out clause is 35 million euros.
Deulofeu has been tipped as the next player to emerge from Barca's hugely successful La Masia academy and make an impression in the first team.
He has made 35 appearances for the Catalans this season, 31 for the B team and four for the senior side, and scored 18 goals.