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A Guardiola reunion may happen sooner than expected
Messi is expected to leave Camp Nou for free at season's end and City may look to land the Argentinastarearly by offering cash-strapped Barcaa small fee.
Both players were targetted by Koeman over the summer and the Dutch manager wants the club to try to sign themagain in January.
The Red Devils believe a swap deal for Paul Pogba may be a possibility in the future with Valverde's buyout clause of£640m (€705m/$826m) making a one-way transfer near impossible.
A Guardiola reunion remains on the cards
Messi was close to forcing through a transfer this season before agreeing to remain at Camp Noudespite strong interest from Pep Guardiola's side.
A move to Manchester now looks like it will happen next season with Barcelona reportedly resigned to the transfer happening eventually.