New Orleans Saints head coach Sean Payton did not attempt to hide his frustration with Michael Thomas' absence from the start of training camp. 

The Saints' star wide receiver had surgery last month to repair an ankle injury that limited him throughout the 2020 season. 

General manager Mickey Loomis told reporters at a pre-camp news conference that the decision was taken to treat Thomas' injury "conservatively" in hopes that it would heal with treatment. 

Thomas participated in last month's minicamp, but the team decided afterward he needed to have surgery to return to 100 per cent. 

"It's disappointing. We'll work through it with the other players that are here," Payton said Wednesday.

"But the surgery took place, and obviously we would have liked that to have happened earlier than later. And quite honestly, it should have."

He declined to elaborate further on the timing of the procedure. 

Earlier, Loomis spoke about the team's thinking around Thomas' injury throughout the off-season. 

"We had an expectation that that would heal and he'd be fine coming into camp this year, but we get to minicamp and obviously it wasn't quite right," he said. 

"Obviously, with hindsight, we would have preferred that surgery to be earlier, in February or March, but it wasn't. It is what it is. And hopefully we'll get him back sooner rather than later."

Loomis declined to put a timeline on Thomas' potential return, and Payton indicated the team will not look for outside help during his absence. 

Thomas, 28, was the NFL's Offensive Player of the Year in 2019 after making a record 149 receptions for a league-leading 1,725 yards and nine touchdowns. 

His 2020 playing time was limited by the ankle injury he suffered in last season's opening game, as he wound up appearing in just seven regular-season games and making 40 catches for 438 yards. 

The New Orleans Saints have long since enjoyed the benefit of continuity on offense in Sean Payton era, but in 2021 they will have to contend with some significant changes.

For the first time since the 2005 campaign, the Saints will begin a season with a quarterback not named Drew Brees as their starter.

Brees' retirement was regarded by some as overdue but, if his decision to ride off into the sunset was not viewed as a damaging one for New Orleans, the loss of the receiver with whom he had built a devastating rapport certainly is a significant blow.

NFL Media's Ian Rapoport reported on Friday that Michael Thomas is expected to miss the start of the season having undergone ankle ligament surgery in June.

Thomas was limited to just seven games last year because of persistent ankle injuries and the procedure to fix those problems will, at least in the opening weeks, rob the Saints' 2021 starting quarterback of a two-time first-team All-Pro who has blossomed from 2016 second-round pick into one of the most dependable wideouts in the NFL.

Renowned for his route-running and his proficiency in making contested catches, Thomas produced at a historic level in 2019.

He broke the single-season receptions record with 149, racking up a career-high 1,725 receiving yards at an average of 107.8 per game.

Per Stats Perform data, Thomas registered a burn, which is when a receiver wins his matchup with a defender on a play where he is targeted regardless of whether the ball is catchable, on 76.1 per cent of his 184 targets.

That was the fourth-highest rate among wide receivers in the NFL. Only one player who finished above him, Corey Davis (69), had even 50 targets.

Thomas was tied for the second-most burn yards per route, trailing only Stefon Diggs (3.9) with an average of 3.6.

He got open on 83.2 per cent of his targets, though he did so with an average depth of target of 8.1 yards, illustrating the Saints' dependence on shorter passes in the latter stages of Brees' career.

Thomas will now miss out on the chance to quickly develop an even better understanding with the two quarterbacks, Jameis Winston and Taysom Hill, vying to be Brees' successor.

The frustration of that for the Saints will be two-fold. Winston's aggressiveness -- he was second in the NFL in air yards per attempt (10.7) in his last season as a starter with the Tampa Bay Buccaneers in 2019 -- could unlock Thomas' potential as a downfield receiver to a greater extent than Brees did.

Meanwhile, Thomas' dependability would be a significant aid to an interception-prone quarterback or to a passer in Hill whose only four pro starts came last season.

Instead of enjoying those possible benefits, with Thomas on the sideline, Payton and the Saints have the imposing challenge of maintaining their offensive consistency without a Hall of Fame quarterback and without their All-Pro wide receiver.

The Saints are used to life among the NFL's offensive elite, but with the two most important parts of the equation on that side of the ball out of the picture, at least for the start of 2021, they face being removed from the top table.

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