The Argentine's current contracts run out next year and he is yet to sign a new contract.
Reports in Spain suggest he is edging closer to signing a new five-year deal but Spanish publication Diario Gol claim he has reservations about Barca's plans.
With Ernesto Valverde set to splash the cash this summer on new signings Messi feels some of the deadwood must be cleared out first.
And the 29-year-old is said to have put forward Paco Alcacer, Andre Gomes and Lucas Digne as players he doesn't feel make the cut at the Nou Camp.
Lionel Messi is stalling on signing a new Barcelona contract Nine players Barcelona could sell this summer Wed, May 31, 2017
Barcelona's new manager Ernesto Valverde is reportedly ready to sell up to nine players this summer, according to Spanish outlet Diario Gol
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Ernesto Valverde could be ready to sell up to nine players this summer
The Argentine is reluctant to put pen to paper on signing an extension unless the club take note of his concerns.
And with Barca desperate to ensure their talisman signs a new deal they are willing to meet his request.
Messi is hoping the club can sign a striker that is on the same level as his team-mates Luis Suarez and Neymar that can be called upon off the bench when needed – and Alcacer doesn't meet his expectations.
Paco Alcacer has struggled to make an impact at Barcelona
Meanwhile, Gomes has failed to adapt to Barca's playing style in his first season at the Nou Camp and Messi feels he isn't an ideal replacement for Andres Iniesta for when he finally hangs up his boots.
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Digne is the last player Messi feels doesn't belong at the club and he is expected to leave in the summer after scoring just one goal for Barca this season.
Arda Turan and Jeremy Mathieu also appear to have their days numbered at the club with Barca officials failing to be convinced of their quality.