Reigning NFL Defensive Player of the Year T.J. Watt and the Pittsburgh Steelers' number-one receiver Diontae Johnson were both forced to leave their side's 19-9 preseason win against the Detroit Lions on Sunday due to injury concerns.

Watt appeared to suffer a knee injury when he was on the receiving end of a cut-block from Lions tight end T.J. Hockenson in the second quarter. He remained in the game for the immediate aftermath, before getting pulled shortly after.

Johnson landed awkwardly on his left shoulder after pulling down a 38-yard reception from Mitch Trubisky, and after being evaluated in the medical tent, he also took no further part in the game.

Despite neither player returning to the field, head coach Mike Tomlin said there is "no long-term concern at the moment" on the broadcast, and "if this is a regular-season game, we may see them back in this game".

Watt is in the first season of his four-year, $112million contract extension, while Johnson signed a two-year extension earlier this month worth up to $39.5m.

Both of the Steelers' contenders for the starting quarterback role performed well in the win, as Trubisky completed 15-of-19 passes for 160 yards and a touchdown, while first-round draft pick Kenny Pickett went 10-for-14 for 90 yards. Neither quarterback committed a turnover.