Nigerian striker Henry Makinwa has signed for Gretna.
Makinwa, who was a free agent, has joined the Clydesdale Bank Premier League's bottom club until the end of the season.
But Irons is delighted with the deal, and said: "Henry is an experienced striker who has got a good pedigree.
"He has played at a high level throughout Europe and that will be beneficial to our side."
Gretna have scored just nine goals in 12 SPL matches so far, prompting the search for reinforcements.
Irons said: "He's a different type of forward to what we have at the club and will give us another option.
"He holds the ball up well and has a good touch. He will bring more players into the game and allow more people to get forward, which is something we need to do."