Johnston and Joshua Palmer (knee) are the top wide receivers left on the Chargers after the team released Mike Williams (knee) and traded Keenan Allen to Chicago.
Johnston recently said he has a "world of confidence" in himself and expects a "breakout" in 2024 under new Chargers coach Jim Harbaugh, ESPN.com's Kris Rhim reports.
Johnston caught of his three targets for 23 yards and a touchdown in Thursday's 63-21 loss to the Raiders.
Johnston caught five of his seven targets for 52 yards in the 6-0 win over the Patriots on Sunday.
Johnston (ribs/ finger) practiced fully Wednesday.
Johnston (ribs) is participating in practice Wednesday, Daniel Popper of The Athletic reports.
Coach Brandon Staley said Monday that X-rays on Johnston's ribs were returned negative, Daniel Popper of The Athletic reports.
Johnston secured one of three targets for seven yards during Sunday night's 20-10 loss to the Ravens.
Johnston caught two of six targets for 21 yards in Sunday's 23-20 loss to the Packers.
Johnston could be a featured target of the Chargers' passing attack with Joshua Palmer (knee) sidelined ahead of Monday's matchup against the Jets.