The San Francisco 49ers roster will soon have the chance for an extended rest, with this week's mandatory minicamp marking the final week of practice before a long pre-training camp break.

While the players may be tempted to look ahead to vacation time with their families, for several on the roster, this week is of critical importance, representing their final chance to leave a good impression on the coaching staff before the serious business of training camp next month.

With several position battles and fights for spots at the bottom of a loaded roster already taking shape well ahead of training camp, here I look at four players who must impress at minicamp.

RB Jordan Mason

Both of the 49ers' primary backup running backs from last season, Mason and Elijah Mitchell, can be considered to be under threat of potentially losing their roster spot after San Francisco added three players at the position this offseason.

San Francisco traded up for Isaac Guerendo in the fourth round of the draft and signed Cody Schrader as an undrafted free agent having come to terms with Patrick Taylor Jr. on a deal earlier in the offseason.

Mitchell has had durability issues throughout his career, but Mason figures to be the back most in jeopardy given the lack of passing game upside has has displayed over his two seasons in the league. Mason only has three receptions to his name in the NFL, while pass protection problems contributed to him playing limited snaps last year. 

Though his contributions have been sporadic, Mitchell has had at least some impact as a receiver over his three years in the NFL, while Taylor was an impressive pass protection back with the Green Bay Packers.

Mason might not get much chance to demonstrate any strides in pass protection in minicamp given the lack of contact in drills, but going forward it will be key for him to prove he can be useful on the rare passing downs where Christian McCaffrey is not on the field. He needs to start proving that sooner rather than later.

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WR Jauan Jennings

The 49ers have demonstrated how highly they value Jennings, handing him a two-year, $15.39 million deal with $10.54 million guaranteed last week.

But after sitting out most of OTAs in pursuit of that contract, Jennings has some catching up to do with rookie first-round pick Ricky Pearsall having impressed in his absence.

Jennings and Pearsall will likely compete for the third wide receiver spot in training camp. While it would be incorrect to say Pearsall has a clear lead after OTAs, he's already demonstrated why the 49ers surprisingly took him 31st overall, quickly learning he playbook and meshing well with quarterback Brock Purdy.

But Jennings has an outstanding rapport with Purdy himself, and he'll feel confident of retaining his place as the third wide receiver if he can use his varied skill set to re-illustrate why the 49ers were keen to tie him down long term over the coming week of practice.

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TE Brayden Willis

Both of the 49ers tight ends taken in the 2023 draft should be pressing the panic button after San Francisco added more reinforcements at the position with the signing of Logan Thomas.

Thomas, who had 490 receiving yards and four touchdowns for the Washington Commanders last year, instantly becomes the favorite to be the number two tight end behind George Kittle, giving the 49ers a complement to their All-Pro starter they have long since lacked.

With the Niners signing Eric Saubert to a contract that features $400,000 of guaranteed money earlier this offseason, three tight end spots on the roster now look to be taken.

It's debatable whether the 49ers will even carry four tight ends on the roster, but it's now clear that at least one of Cameron Latu and Willis will not be on the team come the start of the season.

Latu, a third-round pick in 2023, is still not fully recovered from a knee injury that saw him miss all of last season. Seventh-rounder Willis did at least play sparingly as a rookie and has the advantage over Latu of being healthy enough to practice heading into minicamp.

Willis was used in a variety of roles at Oklahoma, and his versatility and ability to provide some passing-game upside should give him a shot of convincing the 49ers to keep him as a fourth tight end. He cannot afford to waste any time in making his case.

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CB Ambry Thomas

Much of the attention in the secondary is focused on rookie cornerback Renardo Green, the second-round pick whom the 49ers believe has the versatility to play the nickel as well as outside corner.

Starter Deommodore Lenoir has proven he can excel both spots while Samuel Womack III also has experience playing inside and out, but the 49ers' aggressiveness in adding cornerback depth in the offseason has put one player who does not have that versatility in a precarious position.

Thomas is faced with the task of rescuing his 49ers career having previously looked to have claimed a role as a starter on the outside on nickel downs last year, only for postseason struggles to send him back to the bench for the Super Bowl.

With Lenoir, Charvarius Ward, Green and free agent additions Isaac Yiadom and Rock Ya-Sin seemingly ahead of him on the depth chart, Thomas is in a battle with Womack, last year's fifth-round pick Darrell Luter Jr. and Chase Lucas for the sixth cornerback spot, assuming the 49ers even carry that many.

Ward is still recovering from core muscle surgery, meaning Thomas should at least see some second-team reps in minicamp. To persuade the 49ers to continue to use him as a depth option for the final year of his rookie deal, he needs to take advantage of them.

San Francisco 49ers minicamp: Uncertainty around status of offensive stars the dominant storylines

They should gain some clarity.