diff --git a/composer.json b/composer.json
index 246db242..d3094f1c 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "jakeasmith/http_build_url": "^1.0.1"
     },
     "require-dev": {
-        "openeuropa/code-review": "~1.0@beta",
+        "openeuropa/code-review": "~1.0.0-beta3",
         "phpunit/phpunit": "~5.5||~6.0"
     },
     "autoload": {
diff --git a/src/Commands/AbstractDrupalCommands.php b/src/Commands/AbstractDrupalCommands.php
index e74e4f30..28e1592d 100644
--- a/src/Commands/AbstractDrupalCommands.php
+++ b/src/Commands/AbstractDrupalCommands.php
@@ -194,13 +194,13 @@ public function siteInstall(array $options = [
 
         // Define collection of tasks.
         $collection = [
-            $this->sitePreInstall(),
+            $this->sitePreInstall($options),
         ];
         if (!$options['skip-permissions-setup']) {
             $collection[] = $this->permissionsSetup($options);
         }
         $collection[] = $task->siteInstall();
-        $collection[] = $this->sitePostInstall();
+        $collection[] = $this->sitePostInstall($options);
 
         return $this->collectionBuilder()->addTaskList($collection);
     }
@@ -222,11 +222,20 @@ public function siteInstall(array $options = [
      *
      * @command drupal:site-post-install
      *
+     * @option root
+     *   The Drupal root. All occurrences of "!root" in the post-install
+     *   string-only commands will be substituted with this value.
+     *
      * @return \Robo\Contract\TaskInterface
      */
-    public function sitePostInstall()
+    public function sitePostInstall(array $options = [
+        'root' => InputOption::VALUE_REQUIRED,
+    ])
     {
         $tasks = $this->getConfig()->get('drupal.post_install', []);
+        $this->processPrePostInstallCommands($tasks, [
+            '!root' => $options['root'],
+        ]);
 
         return $this->taskCollectionFactory($tasks);
     }
@@ -248,11 +257,20 @@ public function sitePostInstall()
      *
      * @command drupal:site-pre-install
      *
+     * @option root
+     *   The Drupal root. All occurrences of "!root" in the pre-install
+     *   string-only commands will be substituted with this value.
+     *
      * @return \Robo\Contract\TaskInterface
      */
-    public function sitePreInstall()
+    public function sitePreInstall(array $options = [
+        'root' => InputOption::VALUE_REQUIRED,
+    ])
     {
         $tasks = $this->getConfig()->get('drupal.pre_install', []);
+        $this->processPrePostInstallCommands($tasks, [
+            '!root' => $options['root'],
+        ]);
 
         return $this->taskCollectionFactory($tasks);
     }
@@ -402,4 +420,21 @@ public function permissionsSetup(array $options = [
 
         return $this->collectionBuilder()->addTaskList($collection);
     }
+
+    /**
+     * Process pre and post install string-only commands by replacing given tokens.
+     *
+     * @param array $commands
+     *   List of commands.
+     * @param array $tokens
+     *   Replacement key-value tokens.
+     */
+    protected function processPrePostInstallCommands(array &$commands, array $tokens)
+    {
+        foreach ($commands as $key => $value) {
+            if (is_string($value)) {
+                $commands[$key] = str_replace(array_keys($tokens), array_values($tokens), $value);
+            }
+        }
+    }
 }
diff --git a/tests/fixtures/simulation.yml b/tests/fixtures/simulation.yml
index 434203e8..0d60fb4a 100644
--- a/tests/fixtures/simulation.yml
+++ b/tests/fixtures/simulation.yml
@@ -356,3 +356,21 @@
   contains: []
   not_contains:
   - "--db-url='mysql://127.0.0.1:3306'"
+
+- command: 'drupal:site-install --root=foo'
+  configuration:
+    drupal:
+      post_install:
+        - "./vendor/bin/drush --root=!root"
+  composer: ''
+  contains:
+    - "./vendor/bin/drush --root=foo"
+
+- command: 'drupal:site-install --root=foo'
+  configuration:
+    drupal:
+      pre_install:
+        - "./vendor/bin/drush --root=!root"
+  composer: ''
+  contains:
+    - "./vendor/bin/drush --root=foo"