Messi, of course, has spent his entire professional career to date at Camp Nou and he was joined in Catalunya by Brazil superstar Neymar in 2013, while Suarez arrived from Liverpool last summer.
Uruguay international Suarez was only able to make his Blaugrana debut in October, as he was still serving a four-month ban for biting Italy defender Giorgio Chiellini at Brazil 2014, and the striker initially took time to settle in his new surroundings.
However, he went on to play a key role in Barca's treble triumph, with Suarez, Messi and Neymar racking up a record-breaking 122 goals between them as the Catalans claimed La Liga, the Copa del Rey and the Champions League.
“Everyone knows it’s the best forward line in world football," former Barca midfielder Keita told the club's official website. "It was unreal for them to score as many goals as they did last season.
"And it’s also unreal for a team to have three strikers of such class at the same time. Even with Suarez suspended for four months things worked out very well for them."
Keita, of course, was part of the Barca squad that won the treble in 2009, under Pep Guardiola, but he was reluctant to compare Pep Guardiola's side to the current team.
However, the Roma midfielder fully expects Luis Enrique's men to add the Supercopa de Espana, Uefa Super Cup and Club World Cup to their collection before the year is out.
“It’s hard to compare two very different times," Keita added. "Now they can win all six titles as well.
"It is much harder to win the treble than the sextet. It takes five games to win the two Super Cups and the Club World Cup, a lot less than winning the Champions League or la Liga.
"I wouldn’t say the job is already done, but they are very close and they have the squad to do it.”
