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Barca talisman Messi is out of contract in 2021 and there is fresh speculation the six-time Ballon d’Or winner may wish to leave the club, who have not won the Champions League since 2015.

The forward has often been linked with a move to Manchester City to play under his former Camp Nou coach Guardiola.

But the City boss was reluctant to discuss transfers ahead of Thursday's (AEST) Premier League home match against Newcastle United.

He also stressed his stance on Messi has not changed, having previously expressed his hope the Argentine remains with Barca when questioned on the topic.

"I'm not going to speak about transfers until the end of the season," he said. "My wish is that Messi is going to stay in Barcelona."

Asked if a new centre-back was in his plans, he said: "At the end of the season. We still have incredible targets to fight for."

Meanwhile, Guardiola insisted he had no influence on where City's Champions League last-16 second leg against Real Madrid will be played, with a decision due this week.

City lead the tie 2-1 after a win at Santiago Bernabeu before the coronavirus lockdown and reports suggested Guardiola had lobbied UEFA over playing the return leg in Manchester rather than at a neutral venue.

"I am not strong enough to have this impact," he said.

"I am not a president. They have protocols. I have never spoken with UEFA. I have said many times that we want to play in Manchester but we are going to accept wherever UEFA decide to play.

"What I want is to play against Madrid. This is what I want but I didn't make phone calls, I don't have this power."

The club are also getting closer to finding out the verdict from the Court of Arbitration for Sport (CAS) as they appeal against their two-year Champions League ban.

"On July 10 it is the [Champions League quarter-final] draw and [July] 13 will be the sentence," Guardiola added.

"After that, I will give my opinion. We wait for the resolution from UEFA. This season is not going to change. It is so beautiful what we have in front of us."