Xavi acknowledged his "respect" for Robert Lewandowski but offered little more on the Bayern Munich striker ahead of a key European game for Barcelona.
Lewandowski has scored 47 goals in 41 appearances in all competitions for Bayern this season and won The Best FIFA Men's Player award in January.
Bayern were surprisingly eliminated from the Champions League at the quarter-final stage on Tuesday, despite Lewandowski finding the net against Villarreal, who won 2-1 on aggregate.
Oliver Kahn, the Bayern chief executive, said ahead of that second leg the club "definitely" would not sell Lewandowski, who has a year remaining on his contract.
But the former Borussia Dortmund man has been linked with a move to Camp Nou at the end of the season.
Speaking at a news conference ahead of Barca's Europa League quarter-final second leg against Eintracht Frankfurt, Xavi said: "It is not the moment to talk about Lewandowski.
"I respect him a lot as a player, but we focus on tomorrow's match and not potential signings. I will not say anything else about it."
The Blaugrana drew 1-1 in Germany in last week's first leg, where Xavi was unhappy with the length of the grass at the Waldstadion, but he is confident at Camp Nou his players will be able to utilise their possession-based football.
"It's true the pitch wasn't 100 per cent. It is important tomorrow the pitch is good. It should help us improve retention of the ball," Xavi said.
Barca have not lost in 15 games in all competitions, winning 11 of those, and the arrival of Xavi in November has seen the team restore some pride after a dreadful start to the campaign that included elimination from the Champions League group stages for the first time in over two decades.
Despite this form, Xavi declared his coaching job as the "most difficult" in the world, believing the pressure to win as well as play good football makes the Barca role the toughest in football.
"We have an obligation to win and play well," he said. "Imagine what it's like to be at Barca. All week there has been debate about the weekend when we won in the 90th minute [against Levante]. That's what it's like being in Barca. We need to be excellent in everything we do.
"That's why it's the most difficult club in the world. There is nothing to compare it to. In no other country is there a more difficult job.
"We have to win while playing well and that's difficult. Very difficult. It's the most complicated club in the world, I am sure of it."
Raphinha hails Barcelona after statement win over Valladolid
Barcelona forward Raphinha believes the team have laid down a statement of their intent by starting the season with four straight wins in LaLiga.
Raphinha scored the first hat-trick of his career and also delivered two assists on Saturday, as Barca crushed Real Valladolid 7-0 at Camp Nou.
Hansi Flick's side already possess a four-point cushion at the top of the table after also recording victories over Valencia, Athletic Bilbao and Rayo Vallecano.
Raphinha believes their results have demonstrated the club got things right in the transfer market, telling Movistar: "Today's game has shown that there is no need for anyone else to come. We are very happy because of that.
"We are in very good shape. The team is working hard. Today's result shows what we are working for.
"We saw that the coach was on the sidelines asking for more goals and that's our mentality.
"We are hungry and want to score as many goals as we can. When we are dominant like we have been, the best way to respect our rivals is not taking the foot off the gas."
Raphinha was one of the players who faced criticism during Barca's trophyless 2023-24 campaign and was rumoured to be on his way out ahead of the new season.
The Blaugrana again battled financial restrictions throughout the window, allowing Ilkay Gundogan to leave in order to secure the registration of new arrival Dani Olmo.
With his future now certain, Raphinha is keen to nail down a starting spot and contribute on a regular basis.
"I don't know if today's was my best game, but it's certainly among my best. I will try to play even better and as much as I can," the Brazilian said.
"I'm very happy to be able to help the team. I feel good. I knew that this season would be very important for me. I'm looking for my best version to help my team-mates and be more confident."
Barcelona 7-0 Real Valladolid: Raphinha hat-trick helps hosts to emphatic triumph
Raphinha's first career hat-trick helped Barcelona remain perfect in LaLiga as they thumped Real Valladolid 7-0 at Camp Nou.
A commanding display saw Barcelona enter the international break top of the table as Hansi Flick became the first head coach of the club to win each of his first four league games in charge since 2017-18.
Brazilian Raphinha opened the scoring with 20 minutes on the clock, beating Karl Hein with a deft finish after being picked out by Pau Cubarsi.
The hosts entered the interval with a three-goal advantage as Robert Lewandowski struck his fourth of the season before Jules Kounde picked out the top corner in the second minute of added time.
Raphinha grabbed his second of the game just after the hour, completing his maiden treble eight minutes later with another fine finish.
Dani Olmo later marked his home debut with his second goal in as many games for his new club, with Raphinha then turning provider for Ferran Torres to complete the emphatic display.
Data Debrief: Seventh heaven for Barcelona
Raphinha's treble was the first of his career across Europe's top five leagues, scoring two goals for the second time for Barcelona, having done so in April 2024 against Paris Saint-Germain in the Champions League.
Lamine Yamal, meanwhile, has now been involved in 14 goals in 42 appearances in LaLiga (six goals and eight assists), the most by a player before turning 18 in the competition in the 21st century, surpassing Bojan Krkic (13 - 10 goals and three assists).
It also marked Barcelona's biggest win in a LaLiga match since since April 2016 against Deportivo La Coruna at Riazor (8-0) and their biggest home win in the competition since March 2014 against Osasuna (also 7-0).
Brentford 3-1 Southampton: Bees begin life after Toney with comfortable win
Brentford began life without Ivan Toney with a comfortable 3-1 victory over Southampton.
Bryan Mbeumo’s brace and a Yoane Wissa goal proved to be the difference between the two sides and condemned the Saints to their third straight loss since promotion back to the Premier League.
With departed striker Toney watching in the stands after his move to Al-Ahli in Saudi Arabia, the hosts proved too strong for Russell Martin’s men. They created the superior chances and capitalised on an error-strewn performance from Southampton’s backline.
Mbeumo opened the scoring on the stroke of half-time before doubling the lead halfway through the second period and Wissa then got on the scoresheet moments later to continue Brentford’s strong start to the campaign. Yukinari Sugawara bagged a consolation in injury time for the Saints.
Brentford sit in fifth place ahead of the first international break, while Southampton are second-bottom of the league table with zero points.
Data debrief: Wissa continues to prove effective at home
Wissa now has five goals and two assists in his last seven matches at the Gtech Community Stadium.
Brentford have recorded consecutive home league wins for the first time since last November, and the first time in their opening home games since August 2018.
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