The Argentinian arrived at Stamford Bridge from Manchester United in a £40M deal which has not worked out for the 21-year-old who reports claim is set to be sold when the summer window opens.
Garnacho joins a long list of players who have joined the Blues with much excitement surrounding them, only for them to completely fail when introduced into the side.
Speaking on his BBC podcast, Rooney believes Chelsea’s transfer strategy has not worked out in recent years but the introduction of Xabi Alonso as their new head coach next season could turn the side around.
"I think Chelsea will have to sell some players because they’ve got a big squad and have made some very strange signings.
"Selling (Noni) Madueke to Arsenal and signing Gittens, I just didn’t get that, I didn’t understand it. I never got the signing of Garnacho, so there’s been some very strange signings.
"There’s players there they need to get rid of to get some more experience in and help the young players.
"I like the fact Alonso has been announced as manager and not head coach. They’ve got some very talented players so if they get the signings right in the summer I actually think they could be up there challenging for the title. The players will want to play for him because he’s got aura about him."