Xavi has boosted his hopes of becoming the next FC Barcelona coach after guiding Al-Sadd to the Qatar Stars League title without losing a single match.
Al Sadd, who had already secured a record-extending 15th league title earlier in the season, completed a remarkable unbeaten campaign over the weekend after claiming a comprehensive 3-0 win over Qatar SC at the Jassim Bin Hamad Stadium.
Xavi's side won 19 of their 22 league matches throughout the season and drew the other three route to reclaiming their crown from Al Duhail, who ended in second position and 13 points adrift in the league standings.
In doing so, the two-time Asian champions became just the second team in the Qatari Stars League's history to record an "Invincibles" campaign, following Al Duhail's groundbreaking triumph during the 2017/18 domestic season.
The club's success comes as a massive boost to Xavi's hopes of coaching boyhood club Barcelona, where he has been strongly linked as the possible successor to incumbent boss Ronald Koeman in the event that the Dutchman leaves at the end of the season.
Just last month, the former Spain international admitted that he had been in contact with newly re-appointed Barca president Joan Laporta, sparking further speculation that a return to the Nou Camp could be on the cards.
"He is the best president I ever had," Xavi told beIN Sports. "Laporta is a good friend. I know him very well, he will do the best for Barca.
"He is a good president. In my opinion, the best president I have ever had, so he will get Barcelona back, both on the pitch and financially. There are many issues to resolve but Laporta can fix everything. We are in contact. I am very happy for him."
Barcelona have been linked with a host of cost-effective signings in recent times