"I've looked at the players around me and who I might play with, and I think I will add something different," he told the official website.
"There's not a lot of height in the side and that's definitely something I can bring."
The second signing of the day was the left-back Joseph Mills, who also joins on a one month emergency loan deal.
The move follows a hamstring injury to Michael Lea, who looked set to start on the left at Roots Hall as regular defenders Cliff Byrne and Dave Mirfin are all suspended.
Mills is an England U19 international and will go straight into the side for Tuesday's clash with the Shrimpers.