Miller, back with Rangers seven years after leaving for Wolves, struck the post as the Ibrox men beat the German fourth division side thanks to Charlie Adam's first-half penalty.

However, injuries to Adam and DaMarcus Beasley will cause some concern for Smith.

Rangers made a slow start and Christian Dailly had to clear Marius Sowislo's effort off the line.

Centre-backs David Weir and Dailly both had chances at the other end, with Dailly heading just over after Munster goalkeeper David Buchholz missed a corner.

The goalkeeper then conceded the penalty when he brought down Jean-Claude Darcheville after the Frenchman had skipped past him following Lee McCulloch's through-ball.

Adam drove the spot-kick into the bottom corner to give Rangers a 36th-minute lead.

Players from both sides were booked as the game failed to live up to the friendly billing, and Kevin Thomson escaped a second yellow card after a late tackle.

Thomson was replaced by Nacho Novo at the break and the visitors continued to improve.

Miller soon hit the post in his first game since his return to Ibrox in a £2million move from Derby, after being set up by Darcheville.

The Scotland striker had another chance 10 minutes later when he reached Novo's cross but Buchholz denied him.

Beasley pulled up with a hamstring problem before being replaced by young midfielder Dean Furman, and Buchholz produced another good stop after Miller had sent Novo clear.

Adam was next to limp off after suffering an ankle injury, with teenager John Fleck coming on.

Novo put the ball in the net with six minutes left after another precise pass from Miller, but the flag was up for offside as Rangers had to settle for a narrow but deserved victory.