By Wayne Veysey

4th May, 2019 | 7:00am

Allen in transfer overdrive as Rangers set to take summer signings up to four - Ibrox Sources

The summer transfer window has yet to swing open but Rangers have been working feverishly behind the scenes on strengthening a squad that has fallen short again this season.

The man charged with presenting Steven Gerrard with a squad capable of going toe to toe with Celtic next campaign is director of football Mark Allen.

The ex-Manchester City academy chief and his recruitment team have already sealed two new signings ahead of the window, and are close to adding two more.

Rangers have secured attacking duo Jordan Jones and Jake Hastie on pre-contract deals before their current agreements with Kilmarnock and Motherwell had expired.

They announced the permanent capture of Steven Davis on Thursday after he finalised the agreement of a one-year contract after initially joining on loan in January.

The Northern Ireland international has convinced Gerrard he still has plenty to offer at the highest level.

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A source close to the club has told Football Insider that Birmingham City playmaker Greg Stewart has accepted Rangers’ contract offer and he is set to become their fourth signing of the summer before the window has opened.

The experienced playmaker is out of contract at the end of the season and will become a free agent when his three-year deal with the mid-table English Championship outfit expires.

This blizzard of transfer activity in the Spring is not unusual at Rangers, who had tied up the captures of Allan McGregor and Scott Arfield well ahead of last summer’s window opening.

What all four new deals have in common is that they do not involve a transfer fee, although Rangers will pay a modest compensation fee of around £350,000 to Motherwell for Hastie’s developments costs.

Allen has been keen to find value across the market, not just for rising stars, but also for ones proven in Scotland’s top tier like Stewart and Davis.

This set to be only the start of what sources expect will another major squad overhaul this summer.

In other Rangers news, it can be REVEALED that the club are plotting a triple swoop to sign THREE stars from Premier League giants.